Questions about sound and echo
It's story time again.
In this one, I have two groups. One is a large group that has a legitimate purpose for setting off a large explosion at the north end of a particular area. I'm thinking maybe 5 depth charge equivalent blasts set off in unison, but spread out quite a bit. The goal is is to dislodge something on the bottom of a shallow (20 m?) bay.
The second group has a covert task and will be using the sound of the first explosion to mask the sound of their, much smaller, ones (Small shaped charges to blow a hole in something like an oil tank)
As for the setting, it's a long (4500 m) bay ringed almost entirely with a narrow strip of land. To the outside of that land are very thick, tall walls. Basically, it's a bathtub.
The plan, as it stands now, is to have the sound of the first explosion set off the second at just the right time to have the sound of the second explosion mix in with the echo of the first as it gets to the far wall.
I've looked up the speed of sound in air, and salt water, and found values of 334 m/s and 1475 m/s respectively. I'd like the sound of the first explosion to activate the timer to set off the second.
Is it feasible that this would mask the sound of the second explosion?
I'm Not Evil.
An evil person would do the things that pop into my head.