its bigger than 5-6 ft easy, look at the guys foot on on the grate. his foot is on a slight angle and covers 3 of the rows, if he wears avg size 13 show that would make those 3 rows to be about 12 inches wide. the rows under the snake are the same size and when you compare how big the snake is to the rows its over 6 its likely 10-12 ft if not a little more
Unfortuneatly i dont think this is an accurate way. There is no way that snake is 10-12 feet. I would stick with the 5 foot range. We could make a garter snake look like a giant.

And about the comment on the wrong place, even though you thought it might have been a giant, it is still not a python. So being in the giant python area would not be the right place.

Sorry but i cant ID it. I can only say its no where close to a giant. Its just a camera angle issue. Just like the 55 foot boa in China.