Atlantis Resort Phase I, located on Paradise Island in the Bahamas, was designed by WATC for Kerzner International. It involves a $125 million design and upgrade to the resort's existing support structures. The complex's below-grade cisterns, salt-water pump rooms, storage facilities, aquatic laboratories/quarantine areas and underwater structures were overhauled. Above-grade structures such as saltwater lagoons, fresh water pools, rivers, artificial landscape formations and water features, retaining walls, guest facilities, and a 90-foot long suspension bridge were also renovated. DeSimone reviewed and coordinated all site and building work and followed a strict Quality Assurance program to meet the project's rigorous budget and schedule restraints.

For Phase II, DeSimone designed a new 50,000 sf casino and a 24-story, 1,200-room hotel. The hotel component is currently the tallest structure in the Caribbean. A bridge was constructed, which both linked the two hotel towers together and spanned the resort's man-made lagoon. The lower levels of the facility are submerged below sea-level and continue the fantasy theme of the lost city of Atlantis. The expansion also adds a 3 million-gallon open-air aquarium to the resort grounds. Combined with Phase I, the outdoor aquarium habitat is the largest in the world.

The ongoing Phase III expansion is the largest single tourism development ever announced in the Bahamas. This project involves a new 600-key condo hotel, the expansion of the water park's entertainment facilities, a Marina Village featuring 22 retail stores, two additional phases of the timeshare resort "Harbourside at Atlantis", four new restaurants, a 250,000 sf convention center and the addition of the largest ballroom in the Caribbean. Phases II and III were designed by Wimberly Allison Tong & Goo, in conjunction wit HKS, Inc.