Lucas creates an outdoor water room in which a mermaid could live; former clients that love the ocean want to remodel their tiny pool that sits yards away from the Gulf of Mexico.

Lucas and his crew encounter several design firsts as they create a Mexican-inspired resort in a Venice, Fla. backyard.

It's a lifelong dream for a retiring military couple in Huntsville, Ala. to have a dream pool; Lucas designs a gigantic grotto, enclosed spa and the craziest waterfall he has ever built.