GTA V: Interesting Location: Crashed Rusted Cargo Plane

Guess it didn't properly make the takeoff.

In the submarine (which I would suggest to use as half of the plane is very deep.) You can find this very old rusty cargo plane. There was an opening with a ladder to the cockpit but I could not get in there but I didn't see anything either. Some of the weapons are partially hidden so I could not confirm which one I picked up.

At this location you will find:
-Armor (in hull)
-$12,500 case (in hull)
-SMG (?)
-Full Health
-Pump Shotgun
-SMG
-Assault Rifle