@JD-EE the viscosity of water changes a little bit with the amaunt of salt in it.....
but if air is part of the bouyancy, this air will be compressed under the waterpressure, so in that case the bouyancy decrease with deph, and this objekt then sinks faster
To the wing: now I think it is the right wing, (not the left) seen from the front
the text "do not walke outside this area" is written two times on each wing