2 o'clock
Might as well give the men a little rest , '' he added . He poked his head down and called out : `` Turn in and pipe down ! '' Then the commander and the two lads stood watch on the bridge . At 2 o'clock , according to the captain 's reckoning , the submarine was well off the mouth of the Euphrates . `` Can we find our way in by the navigation lights ? '' asked Frank . `` Not much , '' replied Captain Nicholson .