D'après un gars sur IGN, mais c'est vraiment a prendreavec des pincettes ,il ne donne aucunne source mais moult détails
i'm sure you're wondering why it's there. well.... here is the full story i got from an inside source:
the story behind that structure is that it was made by a teamIco designer named orenthal butterforth. he was given a budget of 1.7 million yen (1/20th of the total budget for the game) to make a northeastern arena to house the 17th colossus. things started out well, orenthal "odabee" they called him, initially gathered some of teamIco's brightest and best to the project. they were the first to demonstrate the use of "undulating darkness" in the flows down a dam more massive than early desing docs even proposed. Odabee gave a riveting speech in which he explained that this was the "tentacle darkness" of a thousand years of slain colossi flowing into the heart of the 17th. #17, he promised, would contain more polygonal data then the entire rest of the game combined! to this he was met with a huge standing ovation. designers near ueda said they heard him say "odabee is the son i always wished i had" (note: ueda actually HAS five sons) Odabee was rewarded with a volkswagon cabriolet and 17 thousand yen. While his team liked his vision and appreciated his ambition, they weren't too big on his office behavior. it's said that when one innovative developer added a "Dual bridge" design to the dam and recieved accolades from ueda, odabee went on a rampage, tearing up concept art, and beating him with a rubber club they had made for valus motion capture. As weeks turned into months, odabee was repeatedly showing up to work unshaven, knee-deep in booze, and, on at least two occasions, with hookers he tried to pass off as game testers. Things got worse for odabee in january of 2005 when kenji kaido recieved an anonymous letter from a member of butterforth's team alerting him that "absolutely NO progress has been made on the dam structurally since that initial meeting in which it was so lauded. And the 17th colossus contains far less than the promised number of polygons. To be specific it contains ZERO polygons because Odabee has applied no resources to it. To boot, Master Butterforthsan has so compromised the code for the temple top, it is unlikely this area will be traversible by the game's release." Kaido promptly curled into a fetal position and cried for an entire weekend. It's said that Ueda himself had to sneak Kaido a pair of clean undies since the ones he was wearing had also been "compromised." By june of 2005 things had gotten so bad odabee was to be formally fired with 'dishonor' and replaced by his underling, Milton Turtletaub. This is an amazing embarassment in japanese culture. 3 days later, Turtletaub failed to show up for work. A week after that, he was found floating in the Nagara River. Butterforth was, of course, suspected of foul play until a suicide note was found on Turtletaub saying simply "I'm an ass so I'm killing myself. This is in no way related to Odabee Butterforth, whom i see as a fine upstanding man." So, with the case now closed, teamIco had no choice but to leave Butterforth in place. In august of '05 Ueda called a meeting with the entire company. There was a screaming, crying, ranting, and tantrums of all variety. But, there was no solution to be found. Ueda wiped his eyes, cleared his throat, and said "I'm sorry team.... there will be only 16" He then walked out of the room and was not seen again until the october release of the game. As for Odabee Butterforth, he was not asked back to help out with Trico. Last anyone heard he was offered a contract by sony to dress up as Ratchet for E3 and other sony booth events. supposedly to make sure Butterforth kept quiet and the story never made it to forums and other internet spaces. supposedly G4's Kevin Periera cornered Butterforth at Liepzig to ask him about the rumors. Odabee removed his Ratchet head to go off record and said simply "THIS, what i'm doing right now, this is what it has always been about. I'm living the dream. and teamIco wasn't up to my talents anyway. i'm ashamed to have worked for them and everything i did for them. Yes there was a dam. Yes there was... sort of.... a 17th colossus, that i made some progress with... which is to say i drew some pictures. But since my work with teamIco is such a blot on my record, i'm happy to report that the dam is buried far in the northeast of the map, way beyond reach, where it will never ever ever ever be seen!"
En gros il dit que c'est l'entre du 17e colosse(sisi) mais que le projet a été abandonné (mais a la base il devait y avoir un colosse caché)o_0 je répète que ce n'est pas sur du tout.