So, I was in Guba with two more friends playing in a experimental 0.44 update server, there was huge PvP going on. I've died in the middle of the street, and came from Berezino to get my stuff. Got my crossbow and my backpack from my body, while they were in the top of the hospital covering me. Suddenly, we started to hear a very loud alarm, like the ones from the WW2 or something, we runned a lot and layed in some bushes, then, we logged off. Seriously, I swear to God, it was a very loud alarm, scared the sh*t out of us and we found nothing in Google, anyone has any idea of what was it? Was it a normal thing and we are just a bunch of idiots who didn't know it?