Maritime Underwater Future Capability is the designation for UK Ministry of Defence studies to replace the Royal Navy's Trafalgar-class submarines and follow on from the Astute-class submarine. The MUFC project started as the Future Attack Submarine (FASM), which envisaged the Astute class replacing the Swiftsure-class submarines and FASM replacing the Trafalgar class. In 2001 FASM was cancelled and replaced by MUFC.