“Contents Under Pressure” is episode seven of season one of The 100.
A the end of the previous episode, “His Sister’s Keeper”, Finn was stabbed by the Grounder who had captured Octavia (although that Grounder seemed less aggressive than the others). In order to save his life, Clarke needs help from her mother, Abby (the senior doctor on the Ark), and Raven tries to contact the Ark in order to get said help.
Despite having seen the flares, the Ark is not convinced that the children are still alive – until those on the ground successfully contact the Ark. Unfortunately, there’s a hurricane on top of the landing party which isn’t helping with the radio contact.
Bellamy captures the Grounder for “intelligence” – which probably means something violent.
Political machinations are happening on the Ark.