The MMS class were a class of 402 coastal minesweeper

Minesweeper (ship)

A minesweeper is a small naval warship designed to counter the threat posed by naval mines. Minesweepers generally detect then neutralize mines in advance of other naval operations.-History:...

s built for the Royal Navy

Royal Navy

The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service...

between 1940 and 1945. They were of wooden construction to counteract magnetic mines.

The coastal minesweepers had pennant numbers MMS1 to MMS312 and MMS1001 to MMS1090. They were nicknamed ‘Mickey Mouse’.

Although the Motor Minesweepers lacked the power to tow sweeps for contact mines they were suitable for handling equipment for combating magnetic mines and some later models were fitted with an acoustic hammer on a retractable "A" frame over the bows for countering acoustic mines.

The Motor Minesweepers had limited use post-war so they were quickly disposed of.