Murphy is the sole survivor of his crew, that has been massacred by a German U-Boat in the closing days of World War II. He is rescued, and ends up at a forgotten mission station near the mouth of the Orinoco, and begins to plot his vengeance. He wishes to sink the U-Boat by means of any method imaginable to him, and sets about to make the courageous attempt, assisted by Louis, the administrator of the local oil company.
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| Directing | Peter Yates | Director |
| Writing | Stirling Silliphant | Screenplay |
| Writing | Max Catto | Novel |
| Production | Michael Deeley | Producer |
| Editing | John Glen | Editor |
| Editing | Frank P. Keller | Editor |
| Camera | Douglas Slocombe | Director of Photography |
| Sound | Robin Gregory | Sound Recordist |
| Lighting | Brian Smith | Best Boy Electric |
