Interesting, Frogprince!

It does miss one point about objects sinking through ice though.

When pressure is applied to ice it raises the freezing point of the water, which melts at the points of contact, allowingt the object to sink quite rapidly into the ice, which then freezes over above the object as the pressure is no longer acting on it.

This is how ice skates work. A skater moves on a film of liquid water thawed by the pressure of the blade on the ice.

So the speed with which a heavy aircraft will sink is entirely independent of the age of the ice.

Don T.