I found where the skull is hidden, but I dont know exactly how to make the grenade jump to get to where its at. Every time I try, the grenade doesnt give me enough lift or distance to get up onto the ledge.
Here’s a tut in the PC version
Also here’s a list of hints for all the other skulls and terminals if you need it,
That was just what I needed to work out how to make the jump. I was standing back too far instead of trying to time the jump from being right on top of it.
Nice, glad I could help out. Have fun in the rest of the game.