Why is it said that we won't notice anything special crossing the event horizon of BH? I agree that there is no singularity and the curvature there is not infinite etc. but inside the event horizon everything moves only in one direction, towards the singularity r=0. Therefore it's possible to make body moves only in one direction, e.g. it would be impossible to pull back your hand etc.. Even worse, you would die immediately. So you certainly would notice when you have crossed the event horizon. I am considering supermassive black holes such that the tidal forces are not noticeable locally far away from the singularity.