under sea bases but that's another story for another day. In 1972 Naval Facilities Engineering
in U.S. Energy R&D in 1972 and 1975. Further nuclear subterrain patents in 1975 detailed tunnel
techniques in R&D stages. In 1972, the governing board of the National Research Council formed the
Of massive consequence to this investigation, in 1972, Robert Salter of the R&D Corporation
conventional and unconventional tunneling methods, probably started around 1974. Between 1972