Why would you summon elementals?

[Storm Raven]

Originally posted by Nail
Question: What does an Earth Elemental "see" when underground? The earth or rock is opaque, and the earth elemental does *not* have any sort of Blindsight ability that I can see in the SRD. What is thr range of an earth elementals "sight" while undergound?

It seems to be: 0ft.

What am I missing?

The earth element template from MotP gives earth element creatures 60 foot tremorsense. It seems odd that this is not in the MM description for earth elementals.