That's for sure. I don't know anything about this specific application but having worked in the shipping business and in commercial fishing I can attest to the problems with marine growth and corrosion, not to mention electrolytic issues for any contacting dissimilar metals that are immersed. Presumably all this is accounted for but I have to think the maintenance requirements for a long-term floating installation like this are no less than they would be for a commercial vessel, i.e. about 10% of the "hull value" per annum at a minimum.
