Looking for the name of this movie that I believe is from the 1980s. There is an abandoned quarry that is filled with water. A couple of kids are playing around it and discover there is something in the water. One of them may have even drowned by the supposed creature? (Can't remember.) The big reveal is that it is an excavator under the water and the scoop rises up every now and then due to gases rising from the quarry floor and collecting in the scoop.
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