There are multiple bands with this name:
These are photos from concerts where undertow played, so they may be of other bands that played the concert as well.
Piece of Loin Vol. VII Nov 21 - 22, 2015 72764 Reutlingen, Germany Uploaded by Laza
undertow / Strain / Blindside / Nationhood Apr 18, 1993 Sacramento, California, United States Uploaded by Sacramento Shows