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The fire department says it prepares for the unexpected and on Friday morning, a cave-in that ended up injuring three firefighters.

No one was inside when firefighters arrived. The fire department said the fire was in the basement.

Crews went in to extinguish the fire and as one of the firefighters walked the first floor, he fell through a four by ten foot hole that had caved in by the fireplace.

The fire department says as he fell, a piece of furniture also fell through the hole, hitting two firefighters in the basement. All three went to the hospital. The department says they have non-life threatening injuries.

"Generally it is the unexpected that catches us off guard. This is a situation where we believed we had a fire in the basement and knocking this fire out they asked for people to check for extension up above and we had some people up above and then next thing we know the floor gives way," said Deputy Chief Martin McMillan. "So this fire had a very big head start and burned some large structural members and then you're walking along and surprise it's a cave in basically and we are just very very fortunate."

The fire department is not releasing the names of the injured firefighters. The fire was put out, but the house has significant damage. The cause of the fire is under investigation.