Underwater Hotels Market Assessment, By Location [Coastal Areas, Open Oceans], By Type of Accommodation [Underwater Suites, Underwater Villas, Underwater Pods/Capsules], By Design [Partially Submerged, Fully Submerged], By Target Audience [Luxury Travellers, Adventure Seekers], By Package [Corporate Retreat, Wedding and Honeymoon Packages, All-inclusive Stays, Others], By Region, Opportunities, and Forecast, 2016-2030F