Officials work on a giant sinkhole at Dundas and Wellington road created after a water main broke early Wednesday morning. (SUN MEDIA/MORRIS LAMONT)

LONDON, Ont. - Londoners who got word about the sinkhole in the city’s downtown core were nevertheless stunned when they saw the pool-sized hole for themselves this morning.

Snapping pictures with cellphones and gaping at the gaping breach, onlookers were stunned at its size.

"I was expecting a tiny hole, maybe six feet around, but not something this big and deep," said Ron Myles, 55.

"I was amazed at what’s under the street. Look at how old that is. Our infrastructure is so old and outdated."

Located at the northeast corner of Wellington and Dundas streets, the hole is about as wide and deep as a large backyard swimming pool.

Some gawkers on the scene were relieved it opened up early in the morning, when fewer cars are on the road.

The resulting power outage has also affected traffic, knocking out street lights east and west from Wellington to Ridout and north to south from Dufferin to Dundas.