The tourists had probly expected the diving spot, to look like the very beautiful photos they were shown, when paying top-dollar for a tour of colorful coral reefs with plenty of exotic fish. But any snorkeling trip I have been on in Thailand, have only taken us to the same boring spot as numerous other boats, which had few if any exotic fish or colorful corals, but plenty of tourists.
https://www.phuketalltours.com/uploads/package_tours/tour_krabi/tourkrabi_1562227325346225266.jpg