“Right. Now then, I’m going to row gently along this line until we’re dead in between the two. Get it as exact as you can⁠—for your own sake.”

“Steady!” said Bill warningly. “Back a little⁠ ⁠… a little more⁠ ⁠… a little more forward again.⁠ ⁠… Right.” Antony left the oars on the water and looked around. As far as he could tell, they were in an exact line with each pair of landmarks.

“Now then, Bill, in you go.”

Bill pulled off his shirt and trousers, and stood up.

“You mustn’t dive from the boat, old boy,” said Antony hastily. “You’ll shift its position. Slide in gently.”

Bill slid in from the stern and swam slowly round to Antony.

“What’s it like?” said Antony.

“Cold. Well, here’s luck to it.”