After the time tunnel was perfected, he would simply be teleported to the underground base and returned back to his apartment.
He believes he has not been stopped from speaking out because his time traveling experiences locked him into this timeline. Somehow, by being here (at that time) , he, among others in the program, serve to balance the effects they produced from prior time traveling experiments.
These experiments were designed to put Einstein’s unified field theory to practical use by making a naval ship invisible. While conspiracy theorists debate the existence of the Philadelphia Experiment, one alleged survivor of the scientific outing, Al Bielek, maintained that the Navy’s purpose was entirely different. According to Bielek, the true purpose of the Philadelphia Experiment wasn’t invisibility, it was time travel.