Based on the provided reference (a video thumbnail titled "NASA Just Made a TERRIFYING Discovery In ANTARCTICA No One ..."), it's impossible to provide a definitive answer to what NASA found without more context. The thumbnail title is sensationalized and clickbait-y. The limited text available suggests the discovery might relate to something found not just on Earth, but also on icy worlds like Jupiter's moon Europa.
Without more information, it is impossible to give a specific answer. A reasonable assumption might be that NASA found evidence of extremophiles or conditions suitable for life that mirror those on Europa.
