If it's just a diving experience or snorkeling, there is no need to verify it. The diving experience is usually indoors. Shenzhen has a diving world. Diving pool is 8 meters deep and has a good experience. Other cities don't know much about it. Snorkeling doesn't need a certificate, but the diving depth can only be about 1-2 meters. If you want to dive deep, you still need to verify it.