how did he take this photo?

can anyone help me figure out how to try to take images like this one?  It is almost like the strobe is underneath whatever the crab is standing on (anemone?) with the light glowing from underneath the crab.  

It is by Nicholas More.  nicholasmoreuw on instagram.

https://instagram.fatl1-1.fna.fbcdn.net/v/t51.2885-15/61748161_2106343199658804_7214809927613536747_n.jpg?stp=dst-jpg_e35&_nc_ht=instagram.fatl1-1.fna.fbcdn.net&_nc_cat=100&_nc_ohc=9D1kXI_H8eMAX_dNESs&edm=ALQROFkBAAAA&ccb=7-4&ig_cache_key=MjA1Nzk4MjY0MzYyMjI4Mzg4OQ%3D%3D.2-ccb7-4&oh=00_AT-4pxXoD55O6a0_HeOup0Ky8oc-uZqh3_K3_s-2Gaqv6Q&oe=626A1300&_nc_sid=30a2ef

https://www.instagram.com/p/ByPbE-LBopx/?utm_source=ig_web_button_share_sheet

A guess is he sprinkled some finely chopped food for the crab, or else, somebody picked up and dropped the crab, and N More photo'd  it as it drifted down. But these are just guesses, it might be better to write and ask him.

This photo is another excellent reason why he was named British Underwater Photographer of the Year, some of his admirable uw photos are here:

From the horse’s mouth:

https://underwaterphotographeroftheyear.com/archive/2019-winners/black-white/6/

To feed the crab one would need very finely chopped food on the order of 100 microns as the longest dimension. I have seen and shot these feeding but all I could manage (with the RS and 50mm lens) was looking down on it in its anemone. Kudos for the angle, lighting, as well as not disturbing it (it was feeding so behaving normally).

7 hours ago, Alex_Mustard said:

From the horse’s mouth:

https://underwaterphotographeroftheyear.com/archive/2019-winners/black-white/6/

Ha.  I was expecting some good thoughts but not from the photographer himself! Thank you!  Thanks everyone.

Just to stress-there is no feeding going on here!

Porcelain crabs frequently erect these "nets" to filter out food from the water. It is a common and completely natural behaviour, although rarely captured as beautifully as Nick did.

Yup, extremely difficult to feed these. I have had several opportunities but never did manage to get that perfect shot like Nicholas More :-( Hopefully will ....some day :-) 

Even with a great opportunity, this is the best I could do.

Thanks Alex for the link. 

Diggy