A pool that is used for swimming competitions in Rio turned all green overnight. The weird thing is that only yesterday it was crystal-blue. This has raised serious questions about how safe it can be to swim there and what could possibly cause it.
And apparently it's not just this pool...
For reference, here's a picture of the pool a few days ago.
And here's the underwater camera from yesterday and again from today.
The reason for the swamp-like color? No one seems to know. No one that should know why, anyway. BBC commentator Bob Ballard asked an organizer and got a less than reassuring "I don't know."
Regardless of the fact, the women's 10m synchronized diving finals still took place in the pool. With viewers and athletes taking to Twitter to joke about the situation.
And everyone who thinks they know their science has been offering explanations. Aimee Lewis of the BBC explains:
While this Twitter user blames someone forgetting to put the chlorine in:
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