This was a privilege to work on as a project, given I had a chance to geek out my Greek heritage. The full KS project includes much more than just Atlantean and underwater terrain of course (https://www.kickstarter.com/projects/ecaroth/depths-of-savage-atoll-3d-printable-tabletop-model).
I used only Zbrush and some Meshmixer for primals for this project.