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.
It has also been suggested 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").
Oxford English Dictionary. Orlop n.. Mar. 2009 Online edition. Retrieved 2009-04-06.
In the past, the cheapest passage on a ship was called steerage because the accommodation was in the lowest level of the ship where the steering mechanism was located.
neap tide
The lowest portion of the ship is the hull. Also, the front of a boat is called the bow. The rear of a boat is called the stern. The sails holds the sail. The mast catches the wind.
The dips in waves are called troughs. They are the lowest points of the wave where the water level is at its lowest.
entry level
precinct
neap tide
The lowest level of the Earth's atmosphere is called the troposphere. It is where most weather phenomena occur and contains approximately 75% of the atmosphere's mass.
The lowest level of clouds is called "stratus clouds." These are typically uniform, gray in color, and can cover the sky like a blanket.
The machine level.
deckhouse
It is called sea level.