It could be a massive game spoiler, but it is completely non-cheaty. You use the display table, and transmute random items to get fragments. Once you have enough to build a dive well, put it together. Then, go into buy mode, and ctrl + shift click the well (no TCE required). You can then choose whatever treasure you want the well to have. Make sure to clone the well and assign treasure to each individual well. Then, have you sim explore the dive wells! You are limited to what is in the list, but it is a pretty good list!