Alkaline Vents and Their Deep-Sea Pores: The Workshop That Nurtured First Life

In 2000, geologists surveying the mid-Atlantic found Lost City, a city of white stone rising out of the dark seafloor. It is not a "black smoker" blasting violently hot water. Water from deep inside Earth rises at moderate temperatures, rich in hydrogen and strongly alkaline. When it meets colder, more acidic seawater, minerals precipitate into white towers several metres high. Inside those towers are millions of tiny pores where water and molecules can remain instead of immediately drifting into the ocean.

That detail reaches the hardest question in biology: where did the first reactions happen before cells existed? Modern cells make energy by maintaining a proton difference across a membrane. Protons pass through a specialised protein and help produce ATP, the molecule that powers living activity. Lost City already has a similar difference between hydrogen-rich water inside the wall and seawater outside.