T.107 "Jeløy" (x HMS "Shiant"), T.166 "Karmøy" (x HMS "Inchmarnock") and T.388 "Tromøy" (x HMS "Mincarlo") was departing with convoy JW 62. T.200 "Oksøy" (Kerrera) was left behind due to engine trouble. All ships was equipped to sweep mine and had no anti-submarine weapons, so the were no use as escorts. "Tunsberg Castle" and "Eglantine" sailed as part of the escort on the way to Russia. All ships were intended for service in Northern Norway.

The Norwegian ships arrived in Russia together with the convoy, but stopped at Vayenga in Kolafjord 7.12. "Jeløy" was left behind in Murmansk due to boiler problems, the rest of the Norwegian naval force left Polyarnoye 11.12 at 1320 on their way to Båtsfjord. At about 1530 the force was in open water and formed a line: "Tunsberg Castle", "Tromøy", "Karmøy" and "Eglantine". At about 0400 (12.12) the force was about 20 nm east of Vardø and proceeded towards Harbaken lykt. First was the minesweepers (with Oropesa sweep out), then "Tunsberg Castle" and "Eglantine". At 1004 "Tunsberg Castle" the first explosion occurred on "Tunsberg Castle", shortly after the second explosion occurred. At 1145 the ship sank in position 70º44,5 N/30º09 E.

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Atle