>> I certainly remember the area was surrounded by anti blast walls
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I don't remember anything like that at HMS Dolphin, The torpedoes were brought in by barge from the armament depot and loaded directly into the submarines. The only blast walls are the historic gun emplacements at Fort Blockhouse and the fortified sea wall that protected the harbour entrance (part of HMS Dolphin).
The area I was thinking about was the submarine escape training tank, which had stored high pressure air and oxygen.
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