If you're downtown on Saturday afternoon, look out for the giant geyser-like eruption of steam coming from Parliament Hill.

On July 8, between 4 p.m. and 10 p.m., high-pressure steam will be released from the southwest corner behind Centre Block.

The steam will create a "continuous loud noise," according to Public Service and Procurement Canada.

The new visitor centre will use a steam- and chilled-water system to heat and cool the building. The steam release is part of a process to clean the underground pipes.

Parliament Hill will remain open to visitors.