orcas and dolphins do use tools. so do fish. and of course octupuses use tools. and i didn't mean that tools are impossible in the ocean. it's just that their use is made difficult.

orcas also easily recognize mirrors. i have watched many animals look into mirrors, and orcas and dolphins are by far the most interested and intrigued and show off many behaviors that easily show they recognize the object in the mirror as themselves.

of course there is more to intelligence than technology, which was what I was getting at. orcas use smooth pebbles as a massage center. they coordinate attacks with special roles, including behavior such as signaling to prey that they are leaving while leaving a silent orca behind to catch the prey as they relax. orcas are one of five known species, including humans, to go through menopause. they have complex social structures and dialects and have even been shown to communicate with dolphins.