Corrected entry: The chamber of secrets was created by Salazar Slytherin, some 1000 years before Riddle came to find it. Would the plumbing inside the bathroom never have been changed in 1000 years? Or were the toilets and sinks the same for 1000 years?
KingofallSamurai
23rd Jun 2004
Harry Potter and the Chamber of Secrets (2002)
Correction: In one of the extra-information books provided by Pottermore Presents in coordination with J. K. Rowling, it is mentioned that a descendant of Slytherin who attended the school at the time of the plumbing change probably adapted the entrance while they were building a bathroom on top of it.
22nd Jun 2004
Harry Potter and the Chamber of Secrets (2002)
Corrected entry: Before Tom Riddle came to Hogwarts the toilet was not haunted, but a normal toilet for girls. Wasn't it strange that Slytherin (the man himself) had to go to the girl's bathroom when he wanted to visit his secret chamber?
Correction: Yes, which makes it even less likely for people to think the entrance is there. The chamber is meant to be hidden so no one apart from the heir can find it so the girls' toilets would be a good place.
Correction: Yes, the plumbing would have changed, and obviously has - you can see it. However, Hogwarts is magical so the entrance could probably 'make sure' it wasn't found. The original entrance would have been slightly different to the current one. Bear in mind, Riddle could have altered the entrance so he could find it more easily.
KingofallSamurai