That was several old supply boats, They had on average 4-2000 sack
cement tanks arranged inside the hull, with very tight voids, areas you
could only stick an arm thru and spray like mad. In the summers it
would be in the 120 degree range. Worse than having to hand bucket out
the tanks last 60 or so sacks you could not blow out. Don't get me
going about liquid drilling fluid tanks and the work involved there.
Ever hear of black magic?

Joe