Morituri

Morituri is a movie starring Marlon Brando, Yul Brynner, and Janet Margolin. A war pacifist is blackmailed to pose as an SS officer and to disable the scuttling explosives on freighter carrying rubber cargo to be captured by the...
A German living in India during World War II is blackmailed by the English to impersonate an SS officer on board a cargo ship leaving Japan for Germany carrying a large supply of rubber for tyres. His mission is to disable the scuttling charges so the captain cannot sink the ship if they are stopped by English warships.