HMS Collingwood bombing: 70th anniversary to be commemorated 18 June 2013 Last updated at 07:56 The Royal Navy is commemorating the 70th anniversary of a World War II bombing that killed 33 of its young sailors and was initially hushed up. A sleeping hut at HMS Collingwood in Fareham, Hampshire, was hit on 18 June 1943 and killed sailors who had joined up a fortnight before. But victims' families were first told the trainees died in an ammunitions accident, The mainly 17 and 18-year-old victims will be remembered in a chapel service. Relatives of survivors will then visit the site where the bomb landed. Wonderful propaganda The German bomb struck one of the bases's 36-man sleeping huts in the early hours. HMS Collingwood Association chairman Mike Crowe said: "The bombing at the time was kept hushed up. It would have been a wonderful bit of propaganda had the Germans discovered what they had done with just one bomb. The bombing was still an unknown story in 1958 when Mr Crowe attended HMS Collingwood. For Tuesday's event a wreath will be laid by a tree that was planted for the bombing's 50th anniversary. Commander Andy Phenna, executive officer at HMS Collingwood, said: "If we don't remember the sacrifice our forbearers made we cannot move on to the future."