The governor chatted calmly, as though this were simply a routine sightseeing trip. "Few Americans come to San Luz. We had hoped that perhaps an advertising campaign might bring more of you to our island. We have much to offer, you will agree. Have you tried our swimming yet? I appreciate there has been little opportunity for pleasure."

The boys answered politely, but neither could really get into the swing of the conversation. It took a kind of experience they did not yet have, to talk of casual things while en route to what might be genuine danger.

The governor's secretary called over his shoulder, "There is the roadblock, senor. How shall I approach?"

"Drive up to it, Juan. Be very casual."

Rick fingered the safety on his riot gun. He could see dark figures at the barricade fence.

The car drew to a stop. The governor said quietly, "Perhaps you had better stand by the car. Do not let your guns be seen. If necessary, you will know what to do."

One boy got out on either side, leaving the car doors open. The doors shielded them and the riot guns. The governor got out and walked briskly to the barricade and spoke in Spanish.

It was light enough so Rick could see the men at the barricade clearly. He realized suddenly that they were not dressed as the soldiers had been earlier; these men seemed to be farmers. But they had rifles, and two hand grenades hanging from their belts.

He couldn't follow the exchange in Spanish. The governor was talking in a quiet voice with one man who was better dressed than the rest. The man's voice was cultured, but mocking in tone.

Rick heard the secretary draw in his breath sharply, and he surreptiously got ready to pump a sh.e.l.l into the riot gun's chamber. But nothing happened. Esteben Balgos muttered, "This is unbelievable!"

Then the governor was coming back. He got into the car and spoke quietly. "Back to Calor, Juan."

The boys got in and closed the doors. The secretary swung the big car around and headed back the way they had come. Governor Montoya took time to light an aromatic cigar. Only when it was going well did he speak.

"An interesting talk, senores. Those were not soldiers, but the peons-how do you say it?-tenant farmers of Jaime Guevara. The man with whom I talked is his foreman. They have replaced the troops at all barricades, and their loyalty is only to Guevara."

"But the troops?" Balgos asked.

"Either guarding the volcanic pipe or working in it. I am told that Guevara is now the governor of the island. He has taken over. If I try to resist, it will mean bloodshed. If I leave the island, all will remain quiet and peaceful."

"That's nonsense!" Rick exploded. "Guevara can't get away with it!"

"No? He is getting away with it, Senor Rick. We have a dozen policemen; he has the army. He also has his own men, at key points. So what can we do? We haven't enough force to fight. Besides, there is no time. We can't arm the people because we have neither weapons nor time."

"But what can we do?" Scotty demanded.

"I do not know. At least we can continue our efforts to get the people off the island. Without the ability to make scientific readings, we cannot know how much time is left, so we must hurry. We will do the best we can. After that-well, you had a Spanish song in America that says it well. You recall the t.i.tle? 'Que sera sera.'"

Rick remembered. An expression of fatalism. What will be, will be.

CHAPTER XVI.

THE BRANT APPROACH.

THE magma drove upward, melting its way through the fractured rock of the channels under the western side of the island. Now and then it struck rock with a higher water content, and the island shuddered under a new explosion as the steam expanded.

Rick felt the bed shake under him and sat upright. A new day had dawned, and there was much to do. He and Scotty had volunteered to help Captain Ricardo Montoya plan the evacuation of the island, and the youthful officer had accepted with pleasure. He had agreed to meet them for breakfast.

The scientists had worked late, trying to extrapolate their data into some kind of prediction. Rick and Scotty, tired after an exhausting day, had gone to bed while the light still burned in Hartson Brant's room.

Scotty awoke as Rick's feet hit the floor. "I'm getting used to these little earthquakes," he said. "Don't know if I'll be able to sleep on steady ground after this."

"The ground is going to get unsteadier," Rick reminded. "Until-boom!"

"I'm not forgetting," Scotty said grimly. "Let's get dressed and eat. I'm famished."

"It's ham and eggs for me," Rick told him. "If I had to watch milk slosh around in a cereal bowl I'd get seasick."

The boys dressed rapidly and hurried down to the hotel coffee shop. They were just in time. Ricardo Montoya walked in just as they were seated.

The officer joined them. Rick noted that his face was drawn and tired, and thought Montoya had probably been up a good part of the night. "How's the evacuation going?" Rick asked.

Montoya shook his head. "Poorly. My uncle's radio broadcast continued all night and through the morning hours. A few families have come to the harbor, and the stevedores are organized now to get them aboard ship. A few fishing boats have come, with fishermen's families, but there is no big exodus."

"Don't they realize the danger?" Scotty exclaimed.

"Perhaps. You must understand my people. They have lived with earthquakes all their lives. Not so often, perhaps, but these temblors are not unusual. What is there to be excited about? Who believes El Viejo will explode? It never has, so it never will."

Rick thought it over. "Maybe not enough are hearing the broadcasts."

"That is possible. I have put volunteers to work going from house to house, asking people to turn on their radios to hear the governor, and also to explain the urgency. But it will take a long time, even in Calor."

"If we only had the troops," Rick said thoughtfully. "Trained manpower is what's needed for a job like this."

"True. And I think if my uncle could only talk to the troops they would believe him. But he cannot reach them. Guevara's peons would never let him by."

The hotel loud-speaker system drowned out his last words as a soft feminine voice paged someone in Spanish.

"If only the troops could listen to the radio," Rick commented. "Perhaps they'd believe him and turn on Guevara."

"Perhaps. But soldiers cannot afford radios, and they are away from their barracks now. There is no way for my uncle's voice to reach them."

There had to be, Rick thought. There had to be some way. The loud-speaker sounded again, paging a Senor Alvarez. Rick sat bolt upright. Why not use a loud-speaker?

"Listen," he said excitedly. "If the government radio station has a loud-speaker system, or can make one, we can put it in my plane. I can fly the governor over the troops and he can talk to them direct. My plane can go slowly enough, and low enough for that!"

"How about power supply?" Scotty asked.

"There must be an inverter on the island somewhere. We can use automobile batteries, and the inverter will give us 110 AC for a while, until the batteries run down. Just twenty minutes of power would be enough and we can get that with enough batteries!"

Scotty chuckled. "The Brant approach," he said. "There always is one. How about it, Captain?"

"We will try," Montoya said decisively. "You have not eaten? ... Then do so, while I make a phone call to the radio station. I have had coffee and rolls, and perhaps there will be time to join you for more breakfast while the radio engineers get the equipment together."

The boys were just finishing ham and eggs when Montoya returned. There was a broad smile on his tired face.

"The engineers say it can be done. They have a portable loud-speaker system, and there is an inverter, as you call it, at the transmitter. What is this inverter?"

"It's an electric generator," Rick explained. "Battery current turns it, and it produces 110-volt alternating current. But inverters aren't very efficient, and they take a lot of battery current. That's why we'll need as many batteries as we can carry."

"The chief radio engineer said he understood exactly what was needed. He will gather the materials and meet us at the airport. Now, I think we have time for coffee, and perhaps I can follow your example with ham and eggs. It will take an hour for the equipment to be ready. Also, I called my uncle. He will be waiting for our call."

"Did you get any sleep last night?" Scotty asked.

Montoya smiled. "Sleep? I have forgotten what it is. But perhaps if this plan of yours works, I will remember, eh? Then I can sleep tonight."

A check with the hotel desk told Rick that the scientists had left word that they were not to be disturbed until later in the morning except for an emergency. They had worked a good part of the night, apparently with no satisfactory results.

The boys waited until Ricardo Montoya had breakfasted, then rode with him to the airport. There was another wait while the radio engineers arrived, bringing the loud-speaker equipment.

Rick supervised the placement of the amplifier in the rear seat. The inverter was placed on the floor, and wedged into place with sc.r.a.p lumber. The automobile batteries were put into the luggage compartment behind the rear seat and were also wedged in place.

Wires were run from the amplifier through the rear-seat windows, which were opened just enough to take the thin cables. The leads were then brought out to the plane's struts. Two large loud-speakers were attached to the struts. At first there was some difficulty in figuring out a secure attachment, but the chief engineer, a resourceful type, managed to find a pair of U bolts somewhere in the hangars. They did the job nicely.

The chief engineer connected up, then hung the microphone between the two front seats. He threw a switch and the inverter started up with a whine. At the throw of a second switch, the loud-speakers broke into a hum. The engineer tapped on the microphone, and the tap, greatly amplified, reverberated across the airstrip.

"It works!" Rick exclaimed, delighted.

"Como no?" the engineer said with a smile. He spoke to Montoya in Spanish. The officer translated. "There is one more thing. He has rigged a cable with a switch box so you can operate the controls from the front seat. When the cable is attached, you will be ready. I will go call my uncle."

Rick and Scotty watched as the engineer got busy, hooking the remote-switch cable into the amplifier.

"Room for only two," Rick pointed out. "Want to toss for it?"

Scotty shook his head. "It was your idea. I'll stay on the ground. Take the governor and talk those troops into submission."

"Maybe," Rick said. "We'll see. I think it depends on whether or not they know the real story. If they have any idea there are diamonds around, they won't be interested in anything else."

"Guevara wouldn't dare to let them in on it," was Scotty's opinion. "I'll bet they're just following orders, with no idea what's behind all this. Most of them probably think there really is a national security conference going on."

Rick thought Scotty was probably right. Time would tell. He waited until the engineer signaled that the job was done, then climbed into the pilot's seat. He checked the plane over. Plenty of gas. Everything seemed okay. He tried the loud-speaker switches, then spoke into the microphone. He could hear his voice boom out with thunderous amplification and saw Scotty clap his hands to his ears.

Finally, he started the motor and let the plane warm, keeping an eye on his gauges. When the manifold temperature got high enough he cut the switch. He tested the control surfaces and he was satisfied. Now all he needed was the governor.

Governor Montoya arrived within ten minutes. He inspected the plane and its equipment and nodded his approval. "Very ingenious. Shall we try it?"

"Yes, sir." Rick helped the governor in, buckled his safety belt, then ran around and got into the pilot's seat. He started the motor, waved to Scotty and the others, then taxied out to the runway. The tower gave him clearance and he took off.

"We'll make a swing over the area and locate the troops," he explained, "then I'll slow down as much as I can, and you can talk."

Rick climbed to a thousand feet and set a course directly for the Hot Springs Hotel. He asked, "Sir, how many troops are there?"

"Our army numbers three companies, of about two hundred and fifty men each. Then we have a few special units, including the transportation platoons. Perhaps nine hundred in all. We do not need a large army. But we need some kind of force. These are troubled times, and there is always some danger that a revolutionary force might consider us an excellent staging or training base for an invasion of a nearby country. So, we keep prepared."

The Sky Wagon was over the hotel within minutes. Rick spotted a large group of soldiers-he estimated about two hundred-dispersed around the hotel. They probably thought they were guarding the conference.

He banked left and followed the contour of the mountain, and found another group of soldiers camped near the pumice works.

"That is two companies accounted for, more or less," the governor stated. "Now, can we find the third?"

It wasn't difficult. Rick followed the dirt road to San Souci, and found the third large group marching in the direction of the mountain, apparently about to join forces with the group at the pumice works.

"Let's take a look at the diamond pipe," he suggested, and pulled the Sky Wagon around in a tight circle. He had his bearings, and the third shot station was not difficult to locate. There was considerable activity. Earth-moving machinery had been moved into place and was operating. The yellow ground was already gone, and the equipment was cutting into the blue kimberlite below.

Military trucks were lined up, apparently waiting to be loaded with the blue earth.

"Where are they taking it?" the governor wondered.

Rick had talked with David Riddle about the process. "They need water. The blue earth is run down long wooden tables with cleats on them, like washing out gold. The table is coated with grease. The diamonds stick in the grease and the blue earth washes away. They've probably set things up at the pumice works if there's water there. Otherwise, it may be the hotel."

"It has to be the hotel, then," the governor explained. "There would not be enough water at the pumice plant. Well, I think we have found all our troops. Those who are not with the three companies are below us, digging diamonds. I wonder if they know what they are digging?"

Rick told the governor what Scotty had said.

"That is probably right," the governor agreed. "Guevara would not dare to let too many in on the secret. Well, shall we get to work?"

"Yes, sir," Rick said. He handed the governor the microphone and swung into position for a run over the troops on the road. He throttled down, and then gave the plane a few degrees of flaps. He kept an eye on his air-speed indicator. If he got too slow, the plane would stall and he'd be too low to recover. "I'll make as tight a circle as I can," he said. "Be ready."

The troops came into sight. Rick lost alt.i.tude and began a slow circle only a few hundred feet over the marching soldiers. He turned on the switches and nodded.

The governor began to talk in slow, clear Spanish. Rick understood that he identified himself to the men below, but then he lost the trend of the talk. He concentrated on flying. The loud-speakers were operating perfectly, and he knew the troops could hear.

He could see them looking up and pointing, but they kept marching. Apparently the governor wasn't making much of an impact. The governor paused, and Rick cut the switches.

"Maybe they don't believe it's you," he suggested.

"Perhaps not. But my voice is well known. I speak over the radio at least once a week. More likely the whole idea is just too much for them. Who can believe that mountain over there is about to blow up?"

"Let's try the troops at the pumice works. Maybe you can tell them that all who care about their homeland should march at once to Calor."

"I'll try it," the governor agreed.

Rick circled low over the pumice works while the loud-speakers blasted at the troops below. They watched the plane, they pointed, some ran out for a better look. But when the governor pleaded with them to hurry to Calor to help save the people of the island, nothing happened.

"If El Viejo started smoking, they'd move fast enough," Rick said bitterly. "But then it would be too late. They just don't believe there is any danger, and maybe they're not sure it's you. I guess no one has ever given them orders from the air before."

"They are simple people," the governor agreed. "I think most of them have never heard of a volcano. They don't even know what an eruption is. How can they be excited? If I ever succeed in getting good schools here, this may change. But it won't help us now."

Rick considered. It would do little good to repeat the announcement to the soldiers at the hotel. He wondered if Guevara and Connel were somewhere below, and with that thought he turned toward the diamond pipe.

"Let's see if we can do any good with the truckmen," he suggested. "Tell them the trucks are essential to the safety of their families."