eli5-why is a blast of compressed air slower underwater, if so, but shockwaves stronger underwater?

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eli5-why is a blast of compressed air slower underwater, if so, but shockwaves stronger underwater?

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Compressed air hits a lot more resistance due to having to displace the water in its path, compared to the same equivalent volume of air.

Meanwhile, water is significantly denser and more incompressible than air, which makes it transfer force from shock waves better.