Deepest recorded Secchi depths
Last updated: October 14, 2017 at 17:58 pm
The theoretical maximum value for a Secchi disk immersed in pure water is 80 m (262 ft). The original Secchi disk, which is used to measure water transparency or turbidity, was created in 1865 by Angelo Secchi.
• 80 m (262 ft) – Weddell Sea (Antarctica), 1986
• 66 m (217 ft) – Sargasso Sea, 1972
• 53 m (174 ft) – Eastern Mediterranean, 1985
SOURCE:
Verified by Diving Almanac & Book of Records official
Comments are moderated: (1) Stay on topic (2) Be respectful (3) Refrain from vulgarity and abusive language (4) Do not publish materials that violate copyright. OFFENDING COMMENTS WILL BE DELETED.
Deepest saturation dive (Experimental)
By Jeffrey Gallant / Apr 12, 2017
701 msw (2,300 fsw) — COMEX Hydra 10, Hyperbaric Experimental Centre, Marseille, France, 1992. The...
Read More
Coldest seawater
By Jeffrey Gallant / May 23, 2017
Seawater with an average salinity of 35 ppt (parts per thousand) freezes at -1.94°C (28.5°F). The...
Read More
First saturation dive under polar ice
By Jeffrey Gallant / Apr 7, 2017
Jim English (Memorial University, Canada) and Bob Wicklund (Manager Hydrolab, USA) — Arctic IV Expedition led by...
Read More
Deepest saturation dive (Openwater)
By Jeffrey Gallant / Apr 12, 2017
534 m (1,752 ft) — COMEX Hydra 8, Hyperbaric Experimental Centre, Marseille, France, 1988. Breathing...
Read More
Under ice (Constant weight)
By Jeffrey Gallant / Apr 6, 2017
75.2 m (246.72 ft) — Ant Williams (New Zealand), Storskog Lake, Sør-Varanger, Norway, March 29,...
Read More
First underwater movie
By Jeffrey Gallant / Apr 9, 2017
1914 — John Ernest Williamson and his brother George use the Williamson Photosphere to produce...
Read More
First underwater photo
By Jeffrey Gallant / Apr 9, 2017
1856 — William Thompson (UK) took the world’s first underwater photo in the Bay of Weymouth. The camera...
Read More
Deepest cave dive (Men)
By Jeffrey Gallant / Feb 12, 2017
286.2 m (939 ft) — Xavier Méniscus (France), Font Estramar Cave, France, December 30, 2019....
Read More
High-altitude dive (Highest)
By Jeffrey Gallant / Apr 5, 2017
6,395 m (20,981 ft) — Marcel Korkuś (Poland) dived through the frozen surface of a natural...
Read More
Most poisonous sea urchin
By Jeffrey Gallant / May 19, 2017
Flower sea urchin (Toxopneustes pileolus). The flower sea urchin can deliver a severe sting even...
Read More
Smallest fish (Marine)
By Jeffrey Gallant / May 22, 2017
The male stout infantfish (Schindleria brevipinguis), a.k.a. stout floater, has a maximum standard length of 7.7 mm...
Read More
Underwater aging (Cheese)
By Jeffrey Gallant / May 29, 2017
L’abysse du fjord (Fromagerie Boivin) — In November 2004, 800 kg of cheddar cheese worth...
Read More
Jeffrey Gallant is the Editor-in-Chief and Records Keeper of the Diving Almanac. He is also a contributing editor of DIVER Magazine, and the scientific director of the Greenland Shark and Elasmobranch Education and Research Group (GEERG). Jeffrey started diving in 1982.