Shower pan is cracked around the drain, where is that water going?

(T@B 320S)- We are starting to get cracks around the outside edge of the metal shower drain. I am assuming that water seeping in there isn't going into the main drain as that seems to be only down inside the drain.

What is under the shower pan and where would water potentially go if the pan was cracked? If it drains outside the camper somewhere that isn't a huge deal, but if there is a wood floor under there or something that could get water damaged that is certainly something to be concerned about...

I know we have a plastic covering of sorts under the trailer, so it's not going directly to the ground, but water getting down to that plastic liner should eventually make its way to the ground vs getting inside the camper somewhere...