Panic in the dive tank!
I just want you to know, if you were ever looking for a good cardio work-out, take a rescue diver course and/or volunteer to be the "panicked diver" for confined water training. Thrashing about wildly with a half-inflated or totally deflated BCD is exhausting!
It gets even more fun when you get to try to drown your fellow students! Panicked individuals in the water tend to climb on anything within range instinctively. This means a panicked individual may even attempt to climb on a would-be rescuer, shoving their potential savior under the water and possibly drowning them. Rescue dive students practice releases, or ways to get away from a panicked individual that has gotten a hold of them, but, from an outside perspective, it probably looks like we're trying to drown one another.