These light-loving bacteria may survive surprisingly deep underground
Some cyanobacteria may consume hydrogen to grow without sunlight
![cyanobacteria](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/10/100518_JL_cyanobacteria_feat.jpg?fit=860%2C460&ssl=1)
WHAT LURKS BENEATH This fluorescence micrograph shows traces of cyanobacteria (pink and blue), which typically need sunlight to survive, on a mineral collected more than 600 meters underground.
F. Puente-Sánchez/PNAS 2018