“Well hopefully, if that does happen, FEMA does a hell of a lot better job then they did in Louisiana....”

The size, shape and technology all look right on the mark for a US Navy sonobouy. They get dropped into the Pacific in large numbers to set up ad-hoc sonar networks during military exercises. They are expendable and drift and or sink after they are used.

It is much too narrow to launch from a submarine torpedo tube.

The size looks right on the mark for a sonobouy. We drop them from planes and choppers in large numbers during exercises (and would in war-time) to collect underwater audio intel (submarine hunting), then they are left to drift or sink. They basically form temporary high-fidelity sonar networks.