You fellows would likely be gape jawed to know just how much "bog" (body filler aka Bondo to us inlanders) is floating there.
https://marinas.com/view/marina/n8cm4p_Bradford_Marine_Fort_Lauderdale_FL_United_States
Open the link and click that aerial shot of the marina. Bodacious!
I spent half a summer working in a bit of the upfit fiddley bits that the wealthy like on their yachts (oh, do... not... mess up and call it a "boat")
Worked for a, small, metal contractor (bout 6~7 guys), that worked out of the marina primarily.
We had a door to scratch build and install on a 120-something foot floating mansion.
only 120+ feet long?
Yeah, a bit on the smaller side ("more nimble and less draft. soooo handy in the islands, thank you").
Anyhoo. Laid out the desired points to drill for the locking rod pockets (cool door design! gonna have a hand wheel like a vault door, with three rods that slide out to hold it shut).
Proceed to drill first pilot/probe hole and the bit bites a little, then skids down the side of metal.
aw crap. But I had been forewarned and this was why I doing a bit of test drilling.
What looked like a 5~6" thick wall was about 1/3 "bog" there.
Hmm, might have to revise the door measurements a smidge it seems.
We worked things out in the end though.
Wish I had pictures, but just ended up in Fla on whim one day and the next few months just flew by.
Just kinda got caught up in the day-to-day and never went and tracked down that (much preferred) Fuji film in those 110 cartridges of the era.
Still sorta keep in touch with the Fla "girl" though.