[thedoc (OP)]

Graham McShane explains what happens when you blow things up, both on land and under water...
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[vlado_skopsko]

The energy is moving in a sphere, same as in the air. But the water is almost uncompressible fluid so it transfers the energy better. Its like truing to stub someone with knife attached on a spring or with rigid connection. The second one is better .
In water because of the greater pressure gradient maybe the sphere will be deformed i dont know.