More 'uncredited role' trivia: Derren Nesbitt played the stoker on the upturned collapsible who used a wooden beam to discourage boarders. This sinister-looking blond actor was always in demand for playing unpleasant characters in British TV and film, typified by the black-uniformed SS Sturmbandfuhrer Von Hapen who was no match for Richard Burton in Where Eagles Dare.
Another who stoked the boilers uncredited in ANTR was Welsh actor Glyn Houston, who had just one line: "It's my birthday today as well". Glyn was no stranger to getting his feet wet, having played seamen in just about every 'stiff upper lip' maritime drama of the '50s, including The Cruel Sea, Sink the Bismarck! and The Sea Shall Not Have Them. His actor brother Donald Houston was never seen onscreen with a shovel in hand, but like Derren Nesbitt he did meet his end at the hands of Richard Burton in Where Eagles Dare.
The only other actor listed as an uncredited stoker is Jack Stuart. He, I think, later used the name Giacomo Rossi-Stuart, and became a very familiar face in Italian productions including many war dramas, spaghetti westerns and horror flics. Coping with an iceberg might have been good practice for later dealing with the likes of "the formless blob that threatened to engulf the world".