A planet that lost its atmosphere, destroying its inhabitants, although Nikolai Rozhenko saved one village.
Boraal II is a Class M planet whose atmosphere begins to dissipate, a natural catastrophe that dooms the pre-warp Boraalans. The Federation had posted Nikolai Rozhenko there as a cultural observer.
In Homeward, the Enterprise is ordered not to interfere, but Nikolai secretly beams one village to the ship and keeps them in a holodeck simulation while a new home is found. Worf, surgically altered to resemble a Boraalan, helps guide the villagers until they are settled on another planet.