Hubbard's personal staff, known as the Commodore's Messengers, shuttled between "X" and "S" using various counter-surveillance methods to shake off anyone tracking them: switching between locations, using secret meeting points, relaying information covertly, using aliases and so on. Nobody was allowed to travel directly between the two locations but had to make indirect trips of up to 120 miles. Hubbard himself was at the centre of an elaborate security system with buzzers and red lights to warn him if strangers turned up. Staff were drilled to deny any knowledge of him and maintained a getaway car for Hubbard that was accessible through a garage that opened onto a different street. The existence of Gilman Hot Springs was kept secret even from other Scientologists. Staff members on the base were not allowed to make telephone calls or to send mail directly. If they did get permission to use the telephone, they were instructed to say that they were calling from Clearwater, Florida, where Scientology's Flag Land Base is located.