Just bought a new house - new to me, but it's from '52. My bathtub looks like it's relatively new, and at first use was great. When we recently used it for a bath, however, it felt like there was some water... underneath the floor of the tub? It could be moved around, like a water bubble underneath a lawn.
Worried, I checked the basement - but there's no leak, nothing's even wet. What in the world is going on, and how do I fix it?
Even when the bathtub is empty, the water underneath the floor seems to remain - and it's got worse again when we tried taking another bath (which, in both pro-and-retrospect, we probably shouldn't have done).