At the end of WWII, the Japanese decide to build a secret submarine base in Hong Kong for a last point of resistance. The mariners on a Chinese cargo boat are interned and forced to be labourers. When the Japanese commander orders that the laborers are to be killed on completion of the base, the captain of the cargo boat leads his crew in a fight for survival.
Several members of a Nationalist Chinese Army unit that is trapped between Japanese forces and another Chinese unit take revenge when their unit is almost wiped out.
