Yes. The minimum age for a snorkelling tour is 12 years, and a parent or adult guardian must accompany participants under the age of 18. For diving tours, the minimum age is 17, and a legal guardian's signature is required for those under 18. The minimum age is not negotiable. Other health requirements include not being pregnant, being a minimum 150cm and maximum 200cm, being a minimum 45kg and maximum 120kg, being comfortable in water and constricting clothes, being physically fit, and being able to communicate in English. You can find more information under the - Good to Know - section for each tour.