Following a grounding, what would happen to the level of a slack double bottom tank if the tank was holed?

Correct Answer: Option B — After repeated soundings, the indicated tank level would gradually rise.

If a slack double bottom tank is holed during a grounding, the external sea pressure will force water into the tank. Consequently, repeated soundings will show a rising level as the tank fills with seawater, providing a clear indication of a breach in the vessel's outer bottom plating.