UPDATE: The man who died at Inpex on Wednesday night is understood to have fallen into the tank which was being filled with a dust-like substance.

The alarm was raised around 8pm when the man, who was wearing a harness at the time, fell into substance and disappeared below the surface, it is understood.

It’s not clear whether the harness broke, or was not attached to anything.

Tradie’s death referred to NT Worksafe. A much-loved Darwin tradie, who fell to his death on February 3 2016 was a "LARRIKIN" rigger known as a stickler for safety fell more than 60m to his death in front of his mates after climbing a Telstra tower without a harness on, a coronial inquest has heard.

Mr Kyle-Little, who was working for a Telstra subcontractor, fell after climbing back up the tower without a harness to retrieve tools left behind over lunch.

HEIGHTECH is a supplier of roof safety equipment in NT Australia.