Then Dick directed his attention seaward. He mentally gauging the distance between the shore and the nearest of the mine-sweepers. These vessels were steaming slowly ahead, with sufficient way to stem the ever-running current from the Sea of Marmora to the Ægean. Certainly for the whole time Dick and his companion had been on the lookout there had been no explosion of a caught mine. Apparently the sweepers had almost completed their work up this particular area, and were making a final test to make certain that no hidden peril had escaped them.
The Sub nudged his companion, and the pair retraced their steps until they had put a safe distance between them and the sentry.
"Look here," said Crosthwaite. "We've two things to do. First, to warn our people of the formation of a new Turkish battery, and secondly, to rejoin our ship. The question is: how are we to set about it?"
"Flash a message with the torch," suggested Sefton.
"I thought of that, but dismissed it," remarked the Sub. "For one thing the light's pretty feeble, and our people mayn't spot it. If they did they might think it was a false message sent by the enemy. And another thing: the Turks might notice the glare in the mouth of the tunnel."
"And we would get collared," added the midshipman.
"That's hardly the point. Our liberty is a small matter, but being made prisoners we should have no chance of letting our trawlers know that there is a masked battery being placed in position. No; I think the best thing we can do is to swim for it."
"I'm game," declared Sefton.
"It's quite possible that we'll pull it off all right," continued Dick. "You see there's a steady current always setting down the Dardanelles. That means that if we miss the nearest destroyer or trawler, we'll get swept across the bows of one farther down. Take off your gaiters and see that your bootlaces are ready to be undone easily. We won't discard any more of our gear till we're ready to plunge into the water. That's right; now follow me."
Returning to the barrier at the entrance of the tunnel, the Sub wriggled cautiously over the obstruction until he could command a fairly extensive view of the gun emplacement and its surroundings. The rest of the artillerymen had not returned, while apparently the sentry, having been left to his own devices, had sought shelter from the rain and was enjoying a cigarette.