X-Men Vol. 5: The Burning World (X-Men (2013-2015))

Collects X-Men (2013) #23-26.

When a sinkhole appears under mysterious circumstances in the middle of the Black Rock Desert, the X-Men go to investigate- but little do they suspect that the phenomenon has connections to old allies...and enemies! Then, trapped deep underground in the sinkhole, Storm battles her claustrophobia while trying to find answers.