Blue Planet viewers can't believe that lakes exist under the sea

On Blue Planet II, David Attenborough blew a lot of minds with the revelation that there are lakes at the bottom of the ocean.

That's right: lakes, underwater.

According to the show, brine pools full of super salty water created by erupting methane gas can collect in the depths of the sea. The water is so salty that when an eel dives in to prey on some of the lifeforms that gestate around it - as seen below - it goes through toxic shock, and must rise out of the pool in order to survive.

https://twitter.com/BBCEarth/status/926451294289657856

If this is the first time you're hearing about these deep sea pools, you're not alone; lots of viewers took to Twitter during the show to share their incredulity at the news:

https://twitter.com/EllaCunningham6/status/927274617168977920

https://twitter.com/JakeBedford/status/927275247254102016

https://twitter.com/heatherbowiex/status/927281697460310016

https://twitter.com/ellenmitchellxo/status/927274843673907205

https://twitter.com/TomKimber_/status/927278023518416896

https://twitter.com/ellehamilton_/status/927281410662072322

https://twitter.com/andylapworth/status/927274744692568071

https://twitter.com/emlougreen/status/927275729104048128

https://twitter.com/Luna23x/status/927294052537692161

It's also gone a way to prove that Spongebob Squarepants is more realistic than we had realised:

https://twitter.com/TheJuicyCheese/status/927298577189220352

https://twitter.com/Alicetotheskies/status/927280049409183744

https://twitter.com/LNBruton/status/927286151077093377

https://twitter.com/fionam0rris/status/927274114204753921

Decades in the game, and Attenborough is still well able to blow our minds. Bravo.