In Grey's Anatomy Season 11, Episode 23, titled "," the doctors of Grey Sloan Memorial must set aside their personal grief following Derek Shepherd's death to handle a massive tunnel collapse in Seattle. The Tunnel Collapse Crisis
The episode's central medical emergency involves a catastrophic tunnel collapse that crushes 20 cars, resulting in high casualties.
: Meredith, Maggie, Amelia, and April are dispatched to the site to assist victims.