Which announcement made aboard a naval warship means that all hands must go to battle stations?

Condition Zebra is quite a sobering thing. It's when all the waterproof " hatches " are " dogged down" and you are sealed in that compartment for the duration of the battle. That way if your compartment is breached, only your compartment will flood

Moray, reminds you what you signed up for. oorah!

Thanks, Star Trek!