As Eve looks at the large stone door, she realized that it is roughly the size of the outline she could make out earlier from outside the hill. The group had travelled about the right distance for this to be the same door.  Although, these slabs are set down into the ground, the builders had intended to seal them forever.  Opening it the same way she opened the south entrance would not be possible as these were sealed. She looked at Rockmar and replied.

 "I can't open those doors, they are sealed with some heavy spells in that seal and look at how they are built. That is the north door we could see slightly from outside earlier.