Mysterious 'Bristol hum' perplexes residents of English city

BRISTOL, England, Jan. 28 (UPI) -- A resident of Bristol, England, captured footage of the mysterious "Bristol hum" that has periodically plagued the town.

The video was captured Jan. 4 when the filmer was working on paperwork in his loft and heard a strange noise coming from outside.

The man opens a window and records the mysterious "hum," which has periodically been reported in the city and has often been compared to the hypothetical sound of a UFO.

However, French scientists investigating the cause of the sound said last summer it could have a far more mundane explanation -- the Centre National de la Recherche Scientifique said the humming might be the result of the pressure caused by waves vibrating on the floor of the ocean.