That meteor in Russia was observed to be going at over 10km per second, also it exploded in the atmosphere. If it had been ejected by a volcano the atmosphere would of stopped it there. Also, why haven't these volcanos been discovered. Volcanos do not shoot ejecta for 1000's of kilometers the velocity needs to be in the multiple kilometers per second for that.
Why haven't they been discovered?
The very same reason why the ice dome foundation will never be discovered.
Instant death for anyone who gets remotely close.
If you're thinking of a little north pole and believe it's all been conquered, then it's not surprising your stance will be to reject it out of hand.
Until you go on a mission yourself to see how far you would get, you will never know the real truth and even then you may not find it.