Castle =WH? "Camelot" in JFK era
It was off shore out in the ocean 35 miles west of Imperial Beach/Coronado. I never even felt it.
dead room
A room whose walls, ceiling, and floor are lined with sound-absorbing materials which minimize or eliminate all sound reflections. Used, for example, to test microphones or sound-level meters. Also called dead chamber, dead enclosure, anechoic chamber (1), free field room, or echoless room.
synonym dead chamber
synonym dead enclosure