See the water surface inside the boat? No? That's because it's invisiprim'd.

In case you haven't read it yet...
https://www.firestormviewer.org/pre-release-trailer-part-1...
...Firestorm is re-introducing invisiprims that make the water surface disappear.

This doesn't mean that the old invisiprim script will work again. It means that you won't even need a script anymore. You can flag a prim as an invisiprim in Firestorm itself.

This feature is already available in the current beta version:
https://www.firestormviewer.org/early-access-beta-download...