Length - The distance between the forwardmost and aftermost parts of the ship. By tradition Royal Marines manned the two aftermost turrets. A motor room hatch was added, the motor room being the aftermost compartment. A motor room hatch was also added, the motor room being the aftermost compartment. The aftermost part of this deck is the promenade deck. The aftermost LCMs dropped their ramps and filled with water, sinking in the well deck.