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Gushing from a glacier, rust-stained Blood Falls contains evidence that microbes have survived in prehistoric seawater deep under ice for perhaps millions of years, a new study says.
The colony of microscopic life-forms may have been trapped when Antarctica’s then advancing Taylor Glacier reached into the ocean 1.5 to 4 million years ago. What’s more, the tiny organisms’ feeding habits apparently give the falls their shocking color.
Mikucki and colleagues captured and analyzed a bit of the extremely salty, iron-rich liquid—which seems to be concentrated seawater—fresh from Taylor Glacier. In the samples were tell-tale proteins apparently from microbes.
Since their capture millennia ago, the microbes seem to have been completely isolated. Under 1,300 feet (400 meters) of ice, they catch no sunlight, required for photosynthesis, and have no source of outside food.
The only thing keeping the microbes alive, the study says, is their ability to generate energy from chemical reactions with sulfur and iron.
You could spend a lifetime of fascination learning what you might from that isolated seawater.