Moray-class submarine
Moray was the name of a proposed new class of submarines developed by the Rotterdamsche Droogdok Maatschappij (RDM). While a Moray-class submarine was never actually built, the detailed design of the submarine class was fully completed. Design 
A Moray-class submarine could be built in several sizes depending on the type of submarine that was needed. For smaller submarines that would patrol off the coast there was a design that ranged from 1,100 ton to 1,400 tons displacement, whereas oceangoing submarines ranged from 1,800 to potentially 2,000 tons displacement. Besides customization RDM also offered three standard types of Moray-class submarines which were called the 1100, 1400 and 1800. The number stood for roughly the amount of tonnage of the submarine. The three types had a length of  (1100),  (1400) and  (1800), while the beam was  and the draft . The smallest submarine, the 1100, had space for a crew of 26. The 1800 had space for a crew of 41. While the Moray class was derived from the , it had several differences with that class. The main difference was that the size of a Moray-class submarine was significantly smaller than a submarine of the Walrus class, which displaced around 2,800 tons. Another difference was that the hull of the Moray class was, unlike both the  and Walrus-class submarines, not in the shape of a tear drop. The more straight-lined hull of the Moray class made it possible to extend or shorten the submarine. It also allowed the insertion of a hull section that included a air-independent propulsion (AIP) system. A submarine of the Moray class could also dive less deep than a Walrus-class submarine. The Moray-class submarines had a estimated diving depth of more than . The price of a Moray-class submarine was estimated to cost around 220 million Dutch guilders in 1989. Electric moray 1800
In June 2018 a concept of an fully electric submarine based on the moray 1800 design was presented at the submarine symposium UDT in Glasgow. In the revealed concept the diesel engines and all related equipment were removed from the moray 1800 design together with the lead-acid batteries; these components were instead replaced with lithium batteries. The lithium batteries allowed the 1,800-ton submarine to stay at sea for three weeks before needing to return to recharge its batteries. In addition, there were several advantages and disadvantages to using only lithium batteries to power a submarine. Notes

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External links 
Scale model of a Moray-class submarine at the Rotterdam City Archive (Dutch: Stadsarchief Rotterdam). Submarine classes
Submarines of the Netherlands
Proposed ships