You might be right about it starting dig an egg pit. This would be a bad spot for it to lay eggs, that path gets rototillered/compacted every month to clear out weeds, hopefully it found another spot for its nest. Though when i let it go it seemed headed back to that spot.
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I wouldn't be surprised if it headed back there. Turtles don't understand about tillers, and it's nice soft spot to dig. :-)