British spy base in Oman

"The secret British spy base is part of a programme codenamed “CIRCUIT” and also referred to as Overseas Processing Centre 1 (OPC-1). It is located at Seeb, on the northern coast of Oman, where it taps in to various undersea cables passing through the Strait of Hormuz into the Persian/Arabian Gulf. Seeb is one of a three site GCHQ network in Oman, at locations codenamed “TIMPANI”, “GUITAR” and “CLARINET”. TIMPANI, near the Strait of Hormuz, can monitor Iraqi communications. CLARINET, in the south of Oman, is strategically close to Yemen..." (thanks Nu`man)