With rebreathers it is possible to dive up to 200 meters and more, but this is not the common case. Normally, like it is already said, you stay above 50 meters, but keep in mind that we are out of the hobby-area and the scenario is playing in the future!

Confirmed.
You can see a magazine in your rifle, but other players not.

Tried it with different explosives and different objects. Fences and walls et cetra were destroyed.
What explosiv did you use?

Tried to reproduce it with blufor-mortars and 20/40/60/80 random placement and all were placed somewhere in the area, but not where I placed them.

CONFIRMED for all anti-personal mines (common, bounding and tripwire APERS).
When sealing over the mines as explosive specialist they doesn't trigger, getting on your feeds will trigger them immediately.

Just add a lot of mines and set "appearance" only to fifty percent (or whatever) in the editor. The mines will spawn only randomly.

Duplicate of 0005070
Also it is possible, but you have to write a script (or change the script).

Well, maybe don't hit the helmet next time ;)
Same experience as the others, hitting the head (also other parts of the body) is fatal.

For the DayZ standalone something like this is planned and due to the same developer/related engines it would be really nice.

As far as I know, it is possible. You need to change the respawn script, but I don't know what must be changed.

Ever tried to measure it with a vehicle? The RWS-systems are measuring the distance.

I'll post this note for MadDogX:
You closed 0004914, saying it is a duplicate. Here are two different problems described! I've made a video of the bug in 0004914 and will open a new post in three days. Maybe it would be possible to reopen instead 0004914.
Thanks

The point is that the chopper is going down even if you contact the water only with one tire!
With a car you can drive into the sea and nothing happens until your engine block gets flooded.

Sometimes it also helps to first take the object from the "crate" (car or whatever) to "ground" and pick it up afterwards.

With rebreathers it is possible to dive up to 200 meters and more, but this is not the common case. Normally, like it is already said, you stay above 50 meters, but keep in mind that we are out of the hobby-area and the scenario is playing in the future!

Seems to work with mouth over water, just tried and didn't drowned.

Confirmed.