In 1944 the German navy operated a very successful two-man mini-sub, the Seehund.

BBC: Experts to examine River Foyle, Derry, wreck

The vessel could also be a British two-man mini submarine - known as an X craft, a small boat or even a private yacht - one is known to have sunk in the area many years ago.

BBC: Experts to examine River Foyle, Derry, wreck

Chanderpaul proved the man for the mini-crisis, however, as he rotated the strike adroitly in tandem with Hinds.

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