Catching the sandbags, laying them down one by one, Soldat says, "Probably. Though at least here there's higher ground to get to. On a boat, if you sink, you sink, yeah?" They know they've been on boats. The Sergeant has had flashes of a boat out of New York, shipping out; the Asset seems to have had an assassination on a ship once; and there's a further-back memory of working the docks, tossing things from ships to waiting carts. But nothing about actually sailing them.