That is the anchor locker. Just astern of that is the potty locker.
You need to remove the aluminum threshold from the folding door so you can look thru the gap and find treasure...
If there is lots of treasure, you might consider putting a round access plate in the aft bulkhead of the potty locker.
Looks like you have an I/o with the fuel tank just aft of the door. The fuel tank has a 1" pvc pipe passing under the foamed-in tank, blocked up with 30 years of crap.
When you get that done, go out to 1000 ft and catch a swordfish on that V20 and post pix...
