Tbar, I can't tell you what it is, but there one thing I see, and one thing I don't, that would make me pass on that plant.
First, there are mixed stalks with some above the water. That's what I'm seeing. What I'm not seeing is a split in the leaves like all the hybrid lilies I've seen have. Without seeing a flower, my first thought is that it's American Lotus. Maybe RAH or Bill Cody will have some thoughts.
This is my African Queen moment in 2016. I had to drag my spray boat into the core of the lotus just to get to it all.