wait , i read the bomb will vaporize.. but if that vaporizes ( in a specific radius.. i assume that "hole of "air*" -> where the water used to be before being vaporized) will be filled with something right.. and the water will come in eventually, do.. it will create a wave anyway?
Im not sure if seeing your scenario correctly.

But anyway. i think secret govs have secret devices to stop that, and if they do, trust, me, its a good way towards discloser , and perhaps this is just a programmed step.. :S

who knows!