What are these mysterious recurring noises annoying residents of Salford, a metropolitan borough of Greater Manchester The unexplained noises are loud, grating clanks lasting for a couple of seconds at a time but repeated every 15-20 minutes.  This video was recorded by Scott James at around 3:30am on March 29, 2016. According to the uploader, it was really loud, mechanical, lasting only 10-20 seconds and coming from the Eccles area about every two minutes.:

Official news websites are lost and write: Over the past week we have been contacted by numerous readers being woken in the early hours of the morning by unusual mechanical sounds. There’s loud, grating clanks lasting for a couple of seconds at a time but repeated every 15-20 minutes. Then there’s the sound of gas under pressure – possibly being released. FULL REPORT