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It was not clear what caused the inflated dome roof of Calgary's Subway Soccer Centre to collapse Monday. ((CBC))

The inflated dome roof of Calgary's Subway Soccer Centre has collapsed again.

At about 10 a.m. on Monday, the northeast corner of the bubble dome came down.

"It's flat on its belly, just like a balloon," said Perry Logan, general manager of the soccer centre.

"We did our tests this morning, our checks, you go through air pressure and all those things, and everything was fine."

Nobody was under the bubble at the time, Logan said, and there were no injuries.

This is the second time in two years that the roof has collapsed. In the early morning hours of Dec. 22, 2008, a large chunk of ice pressed against the skin of the bubble and deflated it.

It took three months and about $1 million to fix the dome then.

'We burp the bubble all the time'

Logan said heavy ice and snow accumulation wasn't an issue this time.

"We burp the bubble all the time," he said. "When I came into work this morning … I just automatically look at it, and there wasn't a great accumulation of snow up there. Most of it slides off. We actually cleared the snow away from the base last week."

The deflation appears to have been caused by one of the dome's anchors snapping and ripping a hole in the bubble, Logan said.

The soccer centre's scheduling department is already working to reschedule cancelled soccer matches, he said.

The building holds five soccer fields and Logan said there were about 30 soccer games scheduled for Monday night alone.

The Calgary Minor Soccer Association — which represents more than 12,000 players — has already been in contact with alternative sites in Airdrie and Cochrane, said executive director Daryl Leinweber.

"They've agreed that hopefully they're going to help us out," said Leinweber.

Logan said they might look at putting a new kind of roof on the building to avoid another incident in the future.

The Subway Soccer Centre, located at 7000 48th St. S.E., is about seven years old.