Scotty wrote:

I guess all those big ships with water ballast tanks are just
pretending.


Of course they are. It's just a scam to irritate the
enviro-whackoes.

The Navy is in on the joke, too...
http://p2library.nfesc.navy.mil/P2_O...book/11_9.html

Notice that ship stability takes a back seat to needling
those tree-hugging pinheads: (quote from the above web site)
"Ships with water compensating fuel systems (WCFS) are not
allowed to discharge compensating ballast water overboard in
some navy ports. Navy ship destroyers (e.g., Spruance and
Kidd class) and cruisers (Ticonderoga class) are designed
with WCFS to enhance ship stability."

DSK