From THE SUN:
Ex-Scientologists say the vault was built deep underground by the church in the 1980s at the cost of millions of dollars. Its houses the lectures of church founder L Ron Hubbard on gold discs locked in titanium caskets sealed with argon. The cathedral is protected by three 5,000lb stainless steel airlocks. The weird signs on top of the mountain are to guide Clears, (high-ranking Scientologists) returning from space to find Mr Hubbard’s works after a nuclear Armageddon wipes out humanity.