[1] She was named for Telemachus, a figure in Greek mythology; he was the son of Odysseus and Penelope, and an important character in Homer's Odyssey.

[2] Later in the same month on 17 July whilst on her first patrol in Far Eastern waters, she sank the Japanese submarine I-166 off the One Fathom Bank in the Strait of Malacca.

[3][4] Telemachus sighted the Japanese submarine at 07:08 hours, and fired six torpedoes twelve minutes later at a range of 2,300 yards (2,100 m).

She was refitted at Singapore in late 1950, and again in 1952–1953, after which she spent several months based in Japan providing anti-submarine training for ships taking part in the Korean War.

She again failed to report in as required at 09:45, but a Douglas C-47 Skytrain spotted the submarine before any other ships began to search for her, and the "submiss" order was cancelled.