Went to run a bath today and discovered some damage in the bottom and what looks like a small hole.



The bath has these raised dimples (I assume for non slip) and it looks like one of them has been pushed inward. I think I can use epoxy to fill the hole, but I'm worried about water that might have gone through and be pooling underneath the bath. The bath is tiled in, so I'm not sure how to check, or if this is a real concern or if there's some kind of drainage under the bath. I empty the baby bath in here daily and I'm not sure when this damage occurred.
Any suggestions? Are the only options to either ignore the possibility of water under the bath or to rip out a tile or two?