Recording at a Sound Mirror in North East England. Massive concrete structures used as primitive aircrafts detection.#photography by me pic.twitter.com/gbBSu1y2kN
— Chris Egon Searle (@ChrisEgonSearle) January 12, 2018
Acoustic early warning systems, spectacular remnants of a dead-end technology on the British coast
Recording at a Sound Mirror in North East England. Massive concrete structures used as primitive aircrafts detection.#photography by me pic.twitter.com/gbBSu1y2kN
— Chris Egon Searle (@ChrisEgonSearle) January 12, 2018