Something Strange Is Happening Under the Doomsday Glacier

TL;DR

Thwaites Glacier is melting faster due to underwater hurricane-like vortices and subglacial lake drainage, not just warming oceans alone.

Key Points

• 1.Thwaites Glacier is the world's widest glacier and a critical climate threat. Covering 192,000 km² (larger than Florida), its full melt could raise sea levels 65 cm — and destabilizing it could also collapse the West Antarctic Ice Sheet, adding several more meters.
• 2.The glacier retreats in sudden spurts, not gradual slides. A 2022 study using an autonomous underwater robot found sedimentary ridge deposits proving rapid, episodic retreat over two centuries, with spurts occurring closer together over time.
• 3.Loss of the Thwaites Glacier Tongue has left it more vulnerable. The tongue broke into icebergs starting around 2002; iceberg B-22 (Rhode Island-sized) detached that year, and the most recent fragment, B-22J, was spotted in September 2025.
• 4.Subglacial lake drainage in 2013 created pockets of warm saltwater that may accelerate localized melting. When cold freshwater from drained lakes mixes with warmer saltwater, suspended warm pockets can press against the glacier's surface and speed up melt at those spots.
• 5.Hurricane-like underwater vortices up to 10 km wide are melting the glacier from below. Since 2025, these storms have caused a fifth of all underwater melting events at Thwaites, and they're expected to worsen as ocean temperatures rise, creating a dangerous feedback loop.
• 6.Scientists are debating costly geoengineering interventions, but CO2 reduction remains the priority. Proposed fixes include reflective coverings, snow fences, seafloor berms, and flexible thermal curtains — one curtain alone costs ~$50 billion — though many researchers warn these distract from cutting emissions.