Version: DayZ 0.63 EXP
I have been to the Military Base North of Severograd. When i fast slid down a military watch tower i fell through the map as you can see here: https://clips.twitch.tv/InspiringTemperedTubersCharlieBitMe
When i respawned i was standing on the ground but on my second attempt i was able to walk in the sky as you can see here: https://clips.twitch.tv/AcceptableClumsySeahorseKlappa