An Inshore Minesweeping Unit has been forgotten by the Navy after World War II on the peaceful island of Boonsley and they have adapted to their circumstances. The men still wear uniforms and the proper reports are filed, although the reports of hundreds of mines are exaggerated. The captain spends his time fishing, the Number One is busy romancing the only Wren on the island and The Chief Boatswain runs a wine smuggling business. Unfortunately the Navy start to get suspicious.