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TL;DR : Eels hid beneath the sand, porpoise drags them out creating a 'hole'

It always baffled me why only 1 type of dolphin is showcased in every damn documentary. This one looks so cool.

And it's very shy apparently. Even as someone from the more northern parts of Germany, I didn't know that these creatures lived there!

Endangered and elusive, but not as critical as is smaller Californian cousin. Very cute animals.

Yet it is just a hypothesis at this point with no direct evidence (such as photos)

As stated by the article. To be fair, I also don't always RTFA.