http://www.uesp.net/wiki/Morrowind:Pilgrimages_of_the_Seven_Graces
http://www.uesp.net/wiki/Morrowind:The_Puzzle_Canal
In the quest you have to drown yourself so that the path to the Dremora opens. It does open however, you are stuck and even tcl code can not save you. However using tcl code to reach the dremora before the drowning lets you get past there.

#1