In 1992, the Defence Review announced the decision by the MoD to direct all further submarine expenditure to nuclear-powered submarines. In 1994, the Royal Navy abandoned the Type 2400 program after the first four submarines and Stage 3 was never ordered. The "Upholder" class were declared surplus in 1994 and laid up. "Unseen" was paid off on 6 April 1994, followed by "Upholder" on 29 April and "Ursula" on 16 June. These three submarines were laid up in June 1994. "Unicorn" was paid off on 16 October 1994 and laid up.