yea i kow so are you saying water cant get hotter then 212F?? i boild my wood in a 55G drum over a fire...
Boiling point and vapor point are effectively identical, so you can't get the water above the boiling point.
For water, in an open system, that is nominally 212 degrees.* Plus or minus a bit depending on the air pressure at your location and any chemicals in the water.
You could heat the 55G drum to the melting point and the water would still be at the boiling point. Except the water would have to all boil out to get the metal that hot. With the right size fire, you can boil water in a paper pot.
Neat trivia bit - The temperature of the water at the bottom of the drum of boiling water, is actually below the boiling point of water.
For a Google search, use water boiling point as your search terms.
To answer your question, what you posted shows fungus on the wood and a bacterial bloom in the water. Most of us have been there and done that at one time or another. Yes, it can seem happen quickly. But it doesn't. It grows at a rate that accelerates over time. Such as a day at work or school.