Willis Tower's Glass Floor CRACKS Under Tourists' Feet

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Terror at 1,353ft: They said it was unbreakable but this was the horrifying moment Chicago tower block's 103rd floor glass viewing platform CRACKED under tourists' feet
Family visiting from California evacuated from Willis Tower 1,353ft above the streets of Chicago
Glass floor of tourist attraction The Ledge appeared to shatter beneath them
Transparent viewing deck opened in 2009 on 103rd floor and the three-inch thick glass is meant to withstand 5-tons
The Garibay family said that staff told them the glass was unbreakable before they stepped on
Willis Tower spokesman said that although unusual, this has happened before and is perfectly safe
All four boxes of The Ledge were closed on Thursday morning for maintenance
Workers with MPH peeled the cracked layer of coating on Thursday and replaced it with new glass and caulk
The attraction is set to re-open on Friday
It is what everyone who stands out on The Willis Tower's iconic Skydeck Ledge fears the most.
And on Wednesday night it almost came to pass when a family visiting the Chicago skyscraper suffered the scare of their lives when the glass floor of the tourist attraction 1,353-feet up cracked as they sat down for a picture.
The astonishing incident caused staff to hurriedly evacuate them as the distinct sound of shattering glass could be heard creeping across the glass enclosure that juts out from the 103rd floor of the building.
Rehme added that the visitors were never in any danger.
'This coating does not affect the structural integrity of The Ledge in any way. Occasionally, the coating will crack, as it is designed to in order to protect the surface of the glass,' Rehme said in a statement.
Skydeck general manager Randy Stancik said the Ledge is safe but should give off 'the illusion that it's not safe.'
'We hid the railings, we hid the structural steel — we want to give the illusion that it's a little bit, 'Can I take these two steps out of the building?''he told the Chicago Tribune.

A spokesman for the Willis Tower said that what cracked was a protective coating on the top of three layers of glass one half-inch thick.
'Occasionally this happens, but that's because we designed it this way,' said Bill Utter to The Chicago Sun Times.
'Whatever happened last night is a result of the protective coating doing what it's designed to.'
Utter added that this is not the first time the protective coating has cracked.
Usually it is caused by a visitor having something sharp in their pocket that scratches or cracks the coating.
Workers with MPH peeled the cracked layer of coating on Thursday and put in new glass and caulk.
The attraction will reopen Friday morning after city inspectors check to 'make sure all repairs have been completed according to city code,' spokeswoman Mimi Simon told the Chicago Tribune.
Opened to great fanfare in 2009, The Ledge is comprised of four glass boxes that are suspended more than 1,300-feet above the ground.
They extend four feet out from the Windy City's most iconic structure and with transparent walls, floors and ceilings, provide tourists with the feeling of being suspended on air for those brave enough to peer down.