Harry Alan Towers produced adventure film about an insurance investigator (Richard Todd) sent on a task to oversee what they think may be a dodgy operation with their untrustworthy client (Dale Robertson). Action, murder and diamonds on the high sea. Nothing out of the ordinary for this type of film but enjoyable enough. The captain of the ship is played by German Krimi actor Heinz Drache, Marianne Koch and Derek Nimmo also star.
Notice how the German release puts Heinz Drache on the cover like he's the main star.
Sanders And The Ship Of Death.
