Future Attack Submarine FASM

The seven Trafalgar Class submarines entered service between 1983 and 1991 and are due to start decommissioning from 2010. Under existing plans laid out by the Strategic Defence Review (SDR), two older Trafalgar class submarines will be replaced by two Astute Class submarines expected to be ordered within the next few years. The remainder of the class will be replaced by the Future Attack Submarine (FASM).

This vessel is still in the very early stages of research and development and a range of designs are being considered. Most are nuclear powered although a few of the options under consideration are conventionally powered. One such option is Air Independent Propulsion (AIP). This combines what is seen as the main advantage of nuclear power- endurance- with the cost effectiveness of a diesel electric submarine. Nevertheless, at this stage nuclear power seams the most likely alternative as the navy has both the experience and infrastructure to operate this kind of vessel. Nuclear power will probably result in a submarine between 5,000 and 8,000 tonnes in displacement.

A number of other design innovations are being considered for the Future Attack Submarine: one of these focuses on the use of fibre optics which could eliminate the need for a traditional periscope and conning tower. Other possibilities include the ability to operate unmanned underwater vehicles and machines in a mine warfare role.

It is likely that the Future Attack Submarine (FASM) will be armed with cruise missiles. However, unlike the Swiftsure, Trafalgar and Astute Classes, which launch these through torpedo tubes, the Future Attack Submarine will probably launch them vertically. It is also likely that the high level of automation onboard will mean the submarine could have a complement as small as 50.

Above: An artists' impression of the Future Attack Submarine (FASM), seen here launching a torpedo.

Above: Another artists' impression of the Future Attack Submarine. It is likely that it will be nuclear powered and armed with land attack missiles.