Well, I made a very quick attempt at a dive lot. I didn't fail completely but I did forget my method of stopping them from jumping as they cross the boundary of the dive lot. Mermaids swim in the sky for a few paces as they enter and leave the lot. Will try to work out how I did it. It may involve a cheat but that'll take a lot of time to work out and I have other things I have to do now.
Here's a few pics.
https://s5.postimg.cc/6hn5alr47/CIDL001.jpg
https://s5.postimg.cc/fcnzl40h3/CIDL002.jpg
https://s5.postimg.cc/xs8gijow7/CIDL003.jpg
https://s5.postimg.cc/4pu6fpfh3/CIDL004.jpg
https://s5.postimg.cc/msn96xqrb/CIDL005.jpg
https://s5.postimg.cc/z7a179ajr/CIDL006.jpg
https://s5.postimg.cc/c5tg1hnqv/CIDL007.jpg
https://s5.postimg.cc/w0fhnlniv/CIDL008.jpg
The DL is too deep - that was me using terrain tool to make it deep. It's really hard to get down there to see the mermaids.
Can't understand why there are so many sharks. Particularly since on the surface I placed 1 surface shark spawner and there were at least 7 surface sharks.
Next time I'll take more time over it and hopefully it'll turn out better. At least they have a place to dive in Cake Island now.