Odd footsteps, can anyone explain?

Hi,



I explore disused mines as a hobby. I was exploring a mine passage of Wheal Franco near Horrobridge in Devon, England and we heard the sound of footsteps in the anke deep water. We took no notice, all assuming it was each others footsteps. Then we all stopped to look at something, but the footsteps continued sloshing through the water. We just assumed there was another explorer further down the passage where the footsteps appeared to come from. We walked on and eventally reached the end of the passage, a dead end. The foosteps had stopped when we were about 50 metres from the end, and no one weas there.



There is a lower passage to the mine, but that is full to the roof with flood water. Footsteps in lower levels sound different anyway (more muffled, higher freqency sounds missing).



Can anyone explain this? Only known life forms in the mine are a nest of swallows at the entrance, a lesser horseshoe bat near the entrance and spiders (Meta menardi). The mine is about 300m long.

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