Verifying Solid Subfloor Under Cracked Shower Pan via inspection?

[Shawn Wainsely]

Hi guys, I lost my login info to my old account, so here it goes:

Im looking to close on my first deal, theres a big crack in the fiberglass shower floor right by the drain. Now my concern is that it hasn't been addressed in some time and it has leaked down into the subfloor and the subfloor needs to be replaced.

Can a proper inspection check for this, or how can I check the subfloor without taking the shower out?

Haven't made an offer yet, but getting ready to so I appreciate any advice from the more experienced!