Aquatica, one of the pioneers in the underwater photo industry is shipping their underwater housing designed specifically for the Sony A7SIII
Review: Aquatica Pro A7rIV housing by Phil Rudin
Underwater Camera Housings
Underwater Housing for Sony A7SIII by Nauticam – Hollywood Divers
DNC-2119 Full HDMI Waterproof HDMI Bulkhead Connector M24 for Aquatica A7SIII
Sony A1 Underwater Housings - Underwater Photography Guide
Underwater Housing for Sony A7SIII by Nauticam – Hollywood Divers
Seafrogs Underwater Housing for Sony A7 III A7R III +WA005F Dome Port Kit (+Standard Port), Compatible Sony a7m3 a7r3 with 16-35mm F2.8 GM / 28-70mm F3.5-5.6 Lens : Electronics
AQUATICA D810 Housing for Nikon D810 with 1x Nikonos Connector and 1x Optical Fiber Port
Weekly Nikon news flash #372 - Nikon Rumors
Sony A7S III Review - Underwater Photography Guide
Aquatica A5D Mark III Underwater Housing Kit for Canon 5D MKIII
Use your Sony Alpha a7R III or a7 III mirrorless digital camera to capture brilliant photos and 4K Ultra HD video of the undersea world with the Aquatica A7r III Underwater Housing.
Aquatica Underwater Housing for Sony Alpha a7R III or A7 III with Vacuum Check with Vacuum Check System Depth Rating: 295', Mechanical Controls
Aquatica A7rII Underwater Housing for Sony a7R III Mirrorless Camera: The design of the A7RIII housing is centered around ergonomics and ease of use
Aquatica Sony a7 III & a7R III Underwater Housing A7rIII
Sony A7RIII / A7III Underwater Housing by Aquatica
200DL Underwater Housing for Sony Alpha a7S III Mirrorless Digital Cam