Five of the crew have since have left the ship due to stress-related illness, according to union representatives.

The vessel's departure has again been delayed as the vessel is still one member short of obtaining its minimum safe manning certificate.

The ship is now listed to depart by 9pm today.

"They [the crew] were already confused; they were confused about why they couldn't make a stance and then when the ombudsman started ringing them, it was like the straw that broke the camel's back," Maritime Union's Ian Bray said.

"It's just really inexcusable in that the crew hadn't been breaching any rules when they started to ring them."

Mr Bray said the union was confident they hadn't made any breaches to the Fair Work Commission's orders as the vessel was unable to sail due to regulatory requirements.

The MUA would also look into whether the company breached any part of the privacy act in releasing the contact details of the crew to a third party, Mr Bray said.

The union had requested any documents pertaining to any correspondence between Teekay and the Fair Work Ombudsman's office and between Teekay and Employment Minister Eric Abetz's office in relation to the Alexander Spirit under the Freedom of Information act.

"It'll exonerate in some respects the behaviour of the crew to some extent, but it will also show that the Fair Work Ombudsman's office needs to have a think about it's own policies and how they impact on Australians when they act impartially," Mr Bray said.

Senator Abetz has already denied suggestions that he had provided workers' contact details to the Fair Work Ombudsman.

The tanker has been docked in Devonport since July 1 after crew members refused to leave for Singapore, where they would have been made redundant. The crew has twice been ordered by the Fair Work Commission to end its industrial action.