And his union says the incident occurred after concerns had been raised about holes in the floor of the container, which had been designed to replicate a domestic home setting for house fire simulation.

Understood to have rolled his ankle, the firefighter has had to take time off work. But the TFS says the incident wasn't reported to WorkSafe because no hospitalisation or ongoing medical treatment was required.

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United Firefighters Union Tasmania branch industrial organiser Stephen McCallum said the man could have "broken his leg pretty easily".

"[He's] stepped into the hole," he said. "There's no markings or anything around it. There's just holes in the floor."

Mr McCallum said the TFS training division had sought funding to repair the damaged floor but the request was denied.

"It should really have been tagged out if they weren't going to fix it," he said. "However, it wasn't, and luckily it's only resulted in a rolled ankle."

"However, it's serious enough that [the firefighter has] had to take some time off work."

TFS deputy chief officer Bruce Byatt said the TFS was aware of the damaged floor and that the container would no longer be used for training "until it is repaired".

"As soon as the incident occurred the container was deemed unsuitable for use through [the Police, Fire and Emergency Management Department's] WH&S processes," he said.

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