US colleagues also pointed to his unorthodox denial by the US visa agency to permit him access to dual-use supercomputers, a denial which transpired after his name-dropping jokes about how he could freely access the coveted Cray X-MP at the US nuclear weapons lab LLNL, and a denial which is likely a key factor in how he could have possibly fallen so far from favor in the Soviet establishment. Someone from Moscow would attempt to "phone"/internet access this powerful US computer a few months before his disappearance.