lucky peak reservoir, and had no backstory knowledge. I personally gave him secondary pilot chair, behind Slip Stream, and a slight water fetish, and that was that.
It makes more sense that he was testing the hazardous contaminated waters of Lucky Peak's Sandy Point play area, before he fell in and sunk to the bottom and was caught by my foot. And it makes sense why he comes with all these air sensing tools.
If you can, get Airtight, he is a must.