[Parrotboy]

Amazing how it’s casting a shadow in that deep of water.

[TigersEye]

At 2.3 miles deep the shadow isn’t caused by sunlight.

[Robert A Cook PE]

The sonar signals are very directionally dependent at very the high frequencies needed to get good resolution of “small” parts. So, at depth, if the towed sonar is slightly sideways or off-center of the nominal processed image from the computer, you DO get a very definite “shadow” effect.

I’ve seen it on 3D scanned laser images as well.

[reed13k]

Well technically its a noise shadow not a light shadow since its a sonar pic. might be due to a drift alongside the vessel directing the noise to reflect away from the sensor.

[mcshot]

Truly impressive. Don’t seem to have that visibility in the Great lakes.

[publius911]

Amazing how it’s casting a shadow in that deep of water.

That shadow is created by sonar, not the sun.

[SunkenCiv]

Looks like there have been plenty of responses, so this is all I’ll do. ;’)

[JimRed]

Amazing how it's casting a shadow in that deep of water.

Sonar does not show shadows. But different textures give a different return on the scope.