After a break, I've made good progress, and the completion of this project is getting closer. Only the water of the Mediterranean isn't finished yet, and as always, creating the water's surface presents its own challenges. Here are some of the materials I've used over the past few years:

No. 1 is liquid and pourable. I like this material and have used it, for example, for the waterfall in the
Tibur scene. However, since it's liquid, it would run off the diorama in this project and is unsuitable for creating waves.
Nos. 2 through 5 are acrylic gels that, according to the manufacturers, become crystal clear after drying. The Faller product (2) didn't convince me, and while the Reeves gel (3) does become absolutely clear, it only does so if the layer thickness is about one millimeter maximum, which is really annoying. If the layer is too thick, it remains cloudy and looks terrible.
That's why I bought two new products to experiment with. Lukas makes high-quality artist paints, and I use some of their acrylics. Their crystal gel (4) gave me promising test results, as did the product from Boesner (5). I conducted several tests with these two products to see how they looked after drying and whether they were compatible with each other:



As you can see, these gels look like NIVEA cream when fresh, but become completely transparent after some time.
So I applied the boat and the dolphins and started with the acrylic gel:



First carefully with a few thin layers, then with a thicker one. Well… there's a complication that wasn't obvious in my (apparently inadequate) tests: The drying time doesn't increase proportionally, but exponentially with the layer thickness. At about 1 to 2 mm, it only took 24 to 48 hours for the gel to dry completely. With about 5 mm in the next round (I'm not exactly patient), 13 days (!) have now passed, and the stuff is still cloudy in places:

Not funny. That's why I'm definitely waiting until it's completely clear before applying the next layers. They'll be thin again, if you know what I mean…