Moray[a] was the name of a proposed new class of submarines developed by the Rotterdamsche Droogdok Maatschappij (RDM).
[14][15] Another difference was that the hull of the Moray class was, unlike both the Zwaardvis and Walrus-class submarines, not in the shape of a tear drop.
[1] The more straight-lined hull of the Moray class made it possible to extend or shorten the submarine.
[2] It also allowed the insertion of a hull section that included an air-independent propulsion (AIP) system.
[1][11] The Moray 1800 had the same amount of battery cells as the Walrus-class submarines and an endurance of 65 days.