Yridia Nebula

The Yridia Nebula, also Yridian Nebula was a interstellar gas cloud located near Yridia, in the galaxy's Beta Quadrant. Radioactive gases within the nebula interfered with the operation of sensors. 

History
In December 2256, Sarek's cruiser traversed the nebula for a diplomatic summit with Klingon Houses at 55 Cancri. Logic extremist V'Latak, masquerading as Ambassador Sarek's aide, committed a suicide bombing, leaving Sarek injured and his cruiser wrecked and adrift in the Yridia Nebula.

Through a telepathic bond, Sarek's adopted daughter Michael Burnham learned of the calamity. Captain $𝜇$ allowed a rescue mission but the USS Discovery was unable to enter the nebula as the mycelium spores from its spore drive would interact catastrophically with the radiation. Discovery launched Class C shuttlecraft DSC 01 on a rescue mission. The shuttle crew was able to rescue the injured diplomat before their craft was overwhelmed by nebular conditions.