John Von Neuman discovered why all those sailors that disappeared or got "melded" into the decks of the Eldridge during the Philadelphia Experiment was caused by them losing their "time-locks"...These are a biological system that keeps every living thing safely within our dimension or reality...Without these time-locks we would fly about uncontrollably into other dimensions and maybe never come back to our own..These time locks are set from the day we are born, until the day we die..
What Von Neuman discovered to prevent this happening, was a way to build a sort of "reality bubble" around those people time-travelling which locked them into our dimension..It was said that the US Navy spent 5 million dollars in 1943 for the study and development of this time locking device, which was placed around the wrist of the time-travellers..