Heres a video from my recent trip to Cocos. It was my second time at Cocos since 2006.

We saw six different shark species, but seeing & getting good footage are two different things. As you know, sharks are shy when there is no bait in the water, even the big Tigers. I also saw big Hammerheads schools twice. The first time i had an 18mm WW lense set up (the first time after a few days because the second dive was planned at an arch. I switched lenses too early – a big mistake). I saw the HH school swimming in shallow water, while i stayed at 25-30m at Alcyon. I filmed them, but they looked like ants in the footage…The 2nd time at Alcyone with the proper 28mm lense…the HH school in shallow water again, but too strong current during descent…no chance to set and focus on the camera, as i reached the bottom the sharks were gone

I uploaded directly from DVR in 4K on YT. The 4K video has only 360MB…that resulted in some color banding in the uploaded YT clip, which i don´t have in DVR with a 16bit color depth cam or rendered in decent 4K resolution. No slow-down uw footage in post.

Very cool @Alex B thanks for posting.