During the installation these tanks have been used as ballast compartment.

These warships sacrificed armor plate for a shallow draft and were fitted with a ballast compartment designed to lower them in the water during battle.

"Line checks clear to the ballast compartment," he said.

They all seemed to be down the after ballast compartment so I called down something like, "Come on lads," I've got my seizure, what about yours?

The spill ruptured two of the Diamond Grace's oil-containing compartments as well as a ballast compartment between them.

The ballast compartment covered the gas cylinders.