Also, I saw that the dive business I used while I was there - Amigos Del Mar - got their PADI membership revoked. Maybe they didn’t pay dues but it could be that they have some serious safety violations. Anyways, you may want to also check the business’s professional affiliation before you go. Sorry to be a buzzkill.
Belize’s health care system is terrible so don’t take chances with an emergency. (I didn’t see any elderly people when I was there so I looked Belize up on the WHO website.)