Some of the best tube footage I've seen.    You get a real sense of what it really feels like!

I find the flowing water calming.

The advantage of the gif is you can stare at it for minutes or hours.  When you're actually there, it's 100 times as calming, that micro-second when you realize the beauty of where you are and become hyper-detail aware of everything around you for that one fleeting moment when you see, hear, and feel everything in slowed down time--then you get bashed in the head with a sledgehammer made of water. 

The best description of catching an unanticipated tube in surfing?

Batty: I've seen things you people wouldn't believe. Attack ships on fire off the shoulder of Orion. I watched C-beams glitter in the dark near the Tannhauser gate. All those moments will be lost in time... like tears in rain...