The faint rustling of trash bags is the only noise Sarah Grafton should have heard when she took out the rubbish on an ordinary Tuesday night. But then came the cacophony of rapidly whooshing water and loud humming sounds that rang out in the air. Sarah Grafton is one of many residents who have been kept awake by the mysterious humming noise. Credit: Wolter Peeters“It sounded like an absolute torrent of water, with a little bit of a piercing, whooshing sound. It felt like the noise was in the atmosphere, it felt like it was close – not underground or inside a house,” she said.