For problem 1:
1. Place a CSAT special forces diver team underwater.
2. Place a NATO diver underwater at a distance of around 30 meters away.
3. Engage the CSAT divers.
5. Observe the grenade type explosions around you after engagement that kill you (they only kill if you are at bottom of ocean though, if you are near the top, they still occur, they just do not kill you).