It seems found the info on the new update (Grand Theft Auto 5)

LilBerg
All can be,and he is the Sigle?
And Yes,I put have the decency to large map where to find this place....
PS: Just why it seems to me that this is the bunker from which we tipo flying on the Jetpack

RPOCLABB
He is just the author discovered the place on the map, which for several years already xD

.Chiken
Okay,so memory did not fail me)