A refugee advocacy group says asylum seekers have staged a protest at the Northern Immigration Detention Centre in Darwin by burying themselves in sand.
Ian Rintoul from the Refugee Action Coalition says about 20 men entered a hole yesterday that contractors had recently dug during construction work.
He says tensions are rising at the detention centre because of the length of time asylum seekers are being held.
An Immigration Department spokesman says the men left the trench this morning and are now talking to officials.
Mr Rintoul says the men took the action because they feel no-one is listening to them.
“Nothing is getting out about how they are being treated,” he said.
“In that situation there is, I think, only one way for the anger and things to go, and that is for things to escalate.”