Speaking of Blue Planet, here are some interviews of cameraman Roger Munns, talking about shooting for Blue Planet:
https://www.youtube.com/watch?v=3rgPZ-Y-XXE
https://www.youtube.com/watch?v=W29cFd4y5g8
https://www.youtube.com/watch?v=dL1qhGlM88E
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And here are some interviews with Roger Horrocks on Blue Planet II’s cinematography:
https://www.youtube.com/watch?v=sA0UKdWroYY
https://www.youtube.com/watch?v=rA5pDkQa6fE
https://www.youtube.com/watch?v=Yhmjl5BYIUE
I love the images in the blue planet series, but must say that I also find the colour grading choices in BP2 more than a little odd at times, and have grown a bit weary of the ever present foley track / sound effects.... Same goes for the dramatisation and music, a little little over the top to my taste - defintely part of the current climate though.
I wish there was a chance to see some of this footage in a rawer form, as it’s absolutely fantastic in itself….
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To develop my previous post, here are some other works/videographers that I find interesting for different reasons, and might interest you:
Bubblevision - Nick Hope’s work
Saturation, beautiful macro piece:
https://www.youtube.com/watch?v=g-noK9UVWTk
His classic Reef Life of the Andaman Sea
https://www.youtube.com/watch?v=8ncUVddkK3Q
Murky Secrets:
https://www.youtube.com/watch?v=nJMZ6reOB0E
and more here https://www.youtube.com/channel/UCAeADQLk_FCfXNF9wu3ti8w
The soundtrack is borderline hipster-retro nowadays 
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Ocean Vizion Emeric Benhalassa, has really nice macro work :
https://www.youtube.com/channel/UC6m4oo0knxpgLE0DC7EjtHA/videos
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Same goes for OceanShutter / Dustin Adamson
https://www.youtube.com/c/OceanShutter/videos
https://vimeo.com/dustinadamson
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And Simon at NAD Lembeh
https://www.youtube.com/c/Nad-lembeh/videos
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Eunjae im
https://www.youtube.com/c/EunJaeIm/videos
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Kay Burn Lim
https://vimeo.com/kayburn
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Sea Dragon films
https://www.youtube.com/channel/UC6r1733mhs-Fj7wYisJEUeQ/videos
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This looks promising, Ocean Souls the film:
https://www.youtube.com/watch?v=SghklxQ2nag
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Gombessa/ Laurent Ballestra
https://www.youtube.com/channel/UChRWuH603te9pYd5hxlJvyA/videos
https://vimeo.com/168526737
https://vimeo.com/user96965216
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Pelagic Life / Jeronimo Prietro
Paramount Pelagic
https://vimeo.com/45038806
Mexico Pelagico
https://vimeo.com/102278225
Spring Sea
https://vimeo.com/124788033
and here
https://www.youtube.com/user/jeroprieto/videos
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Simon Spear
https://www.youtube.com/user/simonspear/videos
https://vimeo.com/viewfromtheblue
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Undersea Productions:
https://www.youtube.com/c/UnderseaProductions/videos
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Pall Sigurdsson
https://www.youtube.com/c/PallSigurdsson/videos
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Davide De Benedictis
https://www.youtube.com/c/DavideDeBenedictis/videos
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Sea Dragons
https://vimeo.com/seadragons
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Global Dive Media
https://vimeo.com/globaldivemedia
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Lucas Vaime, Mike Weitch and the Underwater Tribe
https://vimeo.com/user72613668
https://www.youtube.com/c/Underwatertribe/videos
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Nannette Van Antwerp:
https://vimeo.com/nannettev
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Miru Kim
https://vimeo.com/psymiru
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Guillaume Nery and Julie Gautier (films engloutis), on the storytelling, cinematic front
One breath around the world:
https://www.youtube.com/watch?v=OnvQggy3Ezw
Ama
https://www.youtube.com/watch?v=bdBuDg7mrT8
Making of Ama:
https://www.youtube.com/watch?v=CI85pzpki1M
and loads more here:
https://www.youtube.com/channel/UCDwZ2iVPnmtjH0LTjDnWHTg
https://vimeo.com/user28010126
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Behind The Mask, as previously mentioned
https://www.youtube.com/c/BehindtheMask/videos
https://vimeo.com/divestories
Reef Patrol / Vanessa Cara-Kerr
https://www.youtube.com/c/ReefPatrol/videos
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Bug Dreamer / Marcelo Johan Ogata
https://www.youtube.com/channel/UCDAff3CfzyT2aMA9RvLlCpQ
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Flowave Films / Sonja Geier (former videographer on Mermaid, now also collaborating with Behind the Mask, really great vids)
https://www.youtube.com/user/flowavefilms/videos
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And more on the liveaboard videographer front:
Alex Lindbloom (former Mermaid, now Snorkel Venture + freelance)
https://www.youtube.com/channel/UCmns9apOCEjFXL4xrjcbsZw/videos
Nu Parnupong (White/Blue Manta)
https://www.youtube.com/channel/UCfsjW9S03chgdAQyJ-HT0Xw
https://vimeo.com/nuparnupong
Alex del Olmo (7 seas)
https://www.youtube.com/channel/UCeKRSGD5pToQjDULp8mMhdA
https://vimeo.com/alexdelolmo
Solmar / Pelagic Fleet
https://www.youtube.com/c/SolmarVLiveaboard/videos
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Vintage diving footage here:
https://www.youtube.com/channel/UCb7OYKCBLAdonix1X-iLoOg/videos