WO 208/5538 is a 16-page folder with description of the organisation and personell of MK 700. It has relevance to the item in question.The content description of the diaries covers what we are looking for so hopefully should contain a detailed description of the mine and an account of the activity:
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It might worth a shot also this file, I know there are accounts of riverine operations in there: https://discovery.nationalarchives.gov.uk/details/r/C11199840