1976 minelaying exercise on HMS Abdiel.
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More: https://en.wikipedia.org/wiki/HMS_Abdiel_(N21)
Previously:
https://www.homemadetools.net/forum/...227#post126500
https://www.homemadetools.net/forum/...9694#post89851
https://www.homemadetools.net/forum/...924#post119784
https://www.homemadetools.net/forum/...2367#post76229