This is a spotted eagle ray. I ran into three of these in a patch of sea grass looking for something to eat.
They weren't as friendly as the large manta ray I came across before. They didn't want me getting any where near them and "flew" off as soon as I started to get close.
I was looking around a lot more on this swim so I saw them long before they saw me! I let the ocean current take me into where they were which is the only reason I got as close as I did.