I believe these latter samples, that come to the light, are because of the effects of global warming, and they should not shock us. These are the results of the events in the very recent history between nations. What will surprise us, one day, (When they decide to presented to us - After 50 years), will be the revelations of great civilizations that are buried beneath the ice.
The advantage of ice is that it retains the characteristics of excavations (Human - mammals - and constructions) as the pressure exerted on these bodies, in combination with the temperature that develops, is very high.
The Biggest problem is the light, the sun, Nobody can hide something in the sun, because there are too many shadows.
Regards Nikos