I am trying to run a bath in my master suite. Truth be told it hasn't been used in several years as it was something my ex-husband never got to. It is a pre fab insert and I cannot find any type of door to get under there.. Help please.

What is in the area under that floor? Is it a slab, crawlspace or finished room? If it's a finished room under it is it a sheetrock ceiling or acoustic tile?

In some of the spa tubs, the front skirt lifts out.