Train Underwater is a navy blue jelly with turquoise hex, red, pink, purple, and gold micro glitter, and holographic teal micro-glitter. It's stunning, in the bottle and on my nails! It all works perfectly together. I am really, really loving it. On top of that, it was also really easy to apply. Despite being a jelly it had nice coverage on the first coat alone. It was opaque at two coats but I added a third just to be safe. It dried relatively smooth, but I still needed two coats of top coat to get it glassy smooth.
I'm so happy with Train Underwater! If you've never tried Pahlish before, I highly recommend getting this one on your first purchase! It's one of their classics that is popular for a reason.
You can find it here on their Big Cartel site.