There are multiple bands with the name Underdark:
These are photos from concerts where Underdark played, so they may be of other bands that played the concert as well.
Underdark / Grief Ritual / Witcheater / Wispmother Feb 21, 2024 Liverpool, England, United Kingdom Uploaded by Jamie 🌱
Conjurer / Kurokuma / Tuskar / Horsebastard / Hidden Mothers / Blind Monarch / Sugar Horse / Dead In Latvia / Underdark / Sulk / Goblinsmoker / A Horse Called War / Dead Harts / Loyds Trip / Swamp Coffin Jul 24, 2022 Sheffield, England, United Kingdom Uploaded by Lee Twigger
Underdark / Tides of Sulfur / Levitas / Black Pyre Nov 27, 2021 Cardiff, Wales, United Kingdom Uploaded by Ij Travis
Inter Arma / Celeste / Underdark May 3, 2017 Bristol, England, United Kingdom Uploaded by Josh King