I love underwater diving, it's such a cool way to explore the environment. Have you tried it? 
IT is awesome. the ocean is amazing
Oh it so is, as long as you know what you're doing. Safety first, you know? Too many mistakes are made that can be dangerous to divers. 
Yes, some people are careless divers.
Personally, I enjoy diving with a friend. It's not just more fun, but it's also great to have someone there to help you if you run into trouble. 
Yes, it can be scary down there alone!
Yes it can. As long as your friends know what they're doing and can spot a problem when they see it, I'd say the buddy system is the way to go.