The Ark/Dropships

2 dropships were launched in season 1, so far. The 100's dropship and the dropship Diana Sydney and her people were on.

The 100's dropship
The 100's dropship was launched with all 100 delinquents. It was used as a medic bay for Jasper, and a bunker from the Acidic Fog. It was also used as a torture chamber for Lincoln.

Diana Sydney's dropship
Diana Sydney and her people, along with Abigail Griffin. When the dropship was launched, it crippled the Ark, leaving it to darkness. On the ground, Clarke and Bellamy saw what was presumed to be the dropship, it didn't deploy the parachute it was going to fast. Then they saw a mushroom cloud of smoke. It isn't clear of what happened to the dropship.