Where can I find details on long tail making and video and vertical fins

Hi everyone!

I remember seeing some videos of a student film or something in some indoor pools with a number of merfolk in tails that were long and extended past the monofins to have an extra fluke another foot or three down, looking extra serpentine/inhuman at the cost of swimming speed. Anyone remember where those videos are/know if they've been taken down/have ideas on how to make a longer tail? Especially one with a vertical caudal fin?

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I know the one you mean. I tried searching it on youtube with no results.

There is, Aquata Mermaid. She makes extended tails that are quite beautiful.
https://www.youtube.com/channel/UCXe...vEsvBBshqGFl8w

And, Mermaid Lucia has snake tails. Inside is an articulated plastic spine for the snake movements but it doesn't use a monofin. You'd need pure strength to be able to swim in them. She has a youtube channel too, so you can see many snakes swimming about.
https://www.mermaidlucia.com/collect...d-merman-tails