Orlop deck

The orlop is the lowest deck in a ship (except for very old ships). It is the deck or part of a deck where the cables are stowed, usually below the water line. 
It has been suggested the name originates from "overlooping" of the cables, or alternatively, that the name is a corruption of "overlap", referring to an overlapping, balcony-like half deck occupying a portion of the ship's lowest deck space. According to the "Oxford English Dictionary", the word descends from Dutch "overloop" from the verb "overlopen", "to run (over); extend".