Laser cockpit drainer & hull bottom end (bailer) connection..

Hello sailors, I'm Gerry, I just bought a new-old Laser : have the cockpit drainer hole deliberately shuted with resin paste (..couldn't figure out why) THE same at the opposite end at hull bottom (no bailer there).

I'd want to reopen and place bailer BUT I'd want not to make damages so I'd need to know what's there between these two holes, what "links" this holes?..
There have to be some sort of tube.. how that is?.. cheers lads.