orginally I wanted to make a sunken shipwreck for a fish tank.

i looked on the internet and read....

PLA can be used in fish tanks, but it's generally not recommended for long-term use because it can degrade in water and potentially leach chemicals

. To improve safety, you can use a food-safe, aquarium-safe epoxy resin to seal the PLA print, which will prevent it from breaking down and protect your fish. Alternatively, PETG filament is a more durable and naturally non-toxic option for long-term aquarium decorations. 

so take care....

on we go....

First go was not so good, one crows nest fell off when I was removing the supports, so....

next go, I used 30% infill with 6 wall loops and with care removing the supports it survived...

I made 2 bases..... one upright and the other tilted so it looked like a wreck