Usually octopi disappear under the nearest rock when scuba divers are around - this one was a lot more casual, swimming across the reef in a brilliant display of its fluid motion - and with a display of colours that made it look like a skunk
This cuttlefish wasn't bothered by a mere scuba diver - it stood its ground, put on some colourful displays and then contemptuously turned its back when it got bored!
http://Divehappy.com - Cuttlefish are one of the most colourful creatures underwater but I'd never seen one do this - pulsing a stripe of colour along its body repeatedly, like a concert lightshow!