The skipper quitted the chart-room, followed by the three airmen. Coming from the lighted compartment; they were momentarily dazzled by the transition from artificial illumination to murky, pitch-black night.
"Increase speed to fifteen knots," ordered Tressidar. "Where there's water for that strafed U-boat there's enough for us.... Overhauling her? All right; twelve knots, then."
"Those fellows have plenty of nerve," remarked Barcroft, "or else they've no nerves at all. Suppose fog doesn't make the slightest difference to them when they are submerged, but to us it appears otherwise. What is that U-boat doing, I should like to know, plugging along at twelve knots and in the direction of the British coast?"
"Keeping a pressing appointment, perhaps," said the A.P. with a laugh.
"Many a tr
