Henson just told you it is NOT a realistic feature, Tigerfish
to determine a depth, you need a vertical measurment
you could do that if sensors are above from each others.
this is not the case for TA, neither for hull sonars.
But you could argue ... it is the case for sperical !
I won't be really surprised, in fact, if latest sphericals arrays could provide a depth information. Not that accurate, but to give an idea if the contact is under or above OS, measuring the difference on the time upper sensors and down sensors of the sperical will receive the sound track.
As WAA can do horizontally, but in a vertical way.