Todd Russell and Brant Webb were rescued late on Monday

Brant Webb, 37, and Todd Russell, 34, woke on Wednesday in their own beds for the first time since 25 April.

But as their home town of Beaconsfield celebrated their release, questions are being asked about safety conditions at the mine where they worked.

A union said these concerns had existed since a rock fall last October.

"The company made undertakings [at that time] that they wouldn't send anyone back until it was perfectly safe," said Bill Shorten, national secretary of the Australian Workers Union (AWU).

Mr Shorten said the seismic shift which caused the accident was due to deep mining activity rather than an "act of God".

"We have heroes, that's fantastic, but that we needed to have them is terrible," he said.

Tasmania Premier Paul Lennon said on Tuesday that an investigation under the state's workplace health and safety laws would take place in addition to the coroner's inquest already under way.

THE MINERS Todd Russell: 34, married with three children Wanted paramedics to stop off at fast-food joint after rescue Asked for newspaper to scan for other jobs and overtime pay Brant Webb: 37, married to childhood sweetheart Also has three children, including teenage twins Both men determined to walk out of the rescue tunnel Rescue in pictures Press hails rescue

Although neither rescued miner has agreed to speak to the press, more details are emerging of their incarceration and rescue.

Mr Brant dug for four and half hours to free Mr Russell's leg, which was pinned by a giant boulder, in the wake of the accident.

The two men, who were both protected and trapped by the cage they were working in at the time of the rock fall, had to live in the contraption, just the size of a double bed, for the next two weeks.

They were put on a strict diet and exercise regime to keep them fit.

Mr Russell was reported to have spent Tuesday night drinking with friends in town, but Mr Webb was reported to be unwell and resting at home.

A third miner, Larry Knight, died in the initial accident.