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This article has no official name whatsoever. Its current name is tentative.
The Seaman was 5′ 8″ (1.74 m) tall, white male. He had short, gray-white hair and gray eyes. During his appearances on the show, he wore a standard blue seaman suit.
He appeared when Sixth Officer Moody came to take a look at the Third Class passengers. He and another unnamed seaman joined Moody down and helped the Third Class stewards holding passengers back. Steward Turnbull told Moody that the Italian waiters from Gatti's Restaurant were "safely under lock and key", the seamen had locked them up in a storage cupboard.
Suddenly, fireman Mario Sandrini appeared on the other side. Steward Turnbull opened the gate and dragged Sandrini in, all passengers escaped while Sandrini was carried away by the two seamen. They locked him up with the waiters. 
After having completed the order of locking away Mario Sandrini, the seaman boards a lifeboat and escapes the sinking ship. He ends up in the pontoon of Fifth Officer Lowe, and Lowe takes the seaman and Stoker Lyons in Lifeboat 14 to return to the wreck site and pick up survivors. When they find the barely-living Earl of Manton, Lyons & this seaman drag him into the boat.
It is noted that none of the seamen on the Titanic locked any of the À la Carte Restaurant staff members in a locked room. They were kept back by stewards, but Paul Achille Maurice Germain Maugé and Pierre Rousseau were allowed onto deck.
Also their age is inaccurate, György Kívés was 56 during the 10 week shoot of the mini-series. The actual age of the sailors of the Titanic was from 19 to 48.