Recently, after on-site inspections by experts, it was confirmed that the Sansha municipal government officially named the Ocean Blue Cave in Xisha Islands Yongle Atoll as " Sansha Yongle Dragon Cave" (SanshaYongleB lueHole), which has been confirmed to be the world's deepest known ocean blue hole. It is located in Sansha City Yongle Atoll of the Paracel Islands Jinqing Island and the reef of Shiyu. It is 300.89 meters deep. The address coordinate is 16° north latitude. 31′30″, east longitude 111°46′05″. The picture shows an aerial photo of Longdong.
Ocean blue holes are a rare natural geographical phenomenon on the earth. Viewed from the sea surface, blue holes appear a different deep blue color from the surrounding waters, and form huge deep holes on the seabed. They are praised by scientists as "the last place where the earth retains the secrets of the universe for mankind." heritage". The previously proven depth rankings of ocean blue holes in the world are: Bahamas Long Island Deans Blue Hole (202 meters), Hadab Blue Hole in Egypt (130 meters), Belize Great Blue Hole in Honduras (123 meters), Malta Gogo The depth of Zuolan Cave (60 meters) and Xisha Yongle Blue Cave has set a new world record for ocean blue holes.
"Sansha Yongle Dragon Cave" has a long legend. Hainan fishermen said that this is where the Dinghai Divine Needle is. Sun Wukong pulled out the Dinghai Divine Needle to make a wishful golden hoop, leaving an unfathomable dragon cave; some fishermen also said that the Dragon Cave is the eye of the South China Sea, which contains hidden treasures. The treasure of the South China Sea. The picture shows the deep blue entrance of the Sansha Blue Cave, revealing a mysterious atmosphere.
From August 2015 to June 2016, the Xisha Track Research Institute used sonar side scan equipment, electronic counting plumbs, deep sea current meters, deep sea water quality analyzers, underwater robots , underwater photography equipment, etc. The equipment used a combination of scientific equipment detection and artificial diving observation and measurement to successfully determine the depth and basic shape of the blue hole. The expert team, headed by Meng Wei, an academician of the Chinese Academy of Engineering, determined that the exploration results were credible. The picture shows the staff of the Sansha City Coral Reef Protection Research Institute putting the underwater robot into the "Sansha Yongle Dragon Cave " for on-site inspection.
After investigation, it was found that the Yongle Blue Cave in Xisha is basically a vertical cave. The diameter of the blue cave is 130 meters, and the diameter of the bottom of the cave is about 36 meters. It has not been observed that the blue cave is connected to the outer sea, and there is no obvious flow of water in the cave. Through visual inspection, more than 20 kinds of fish and other marine life similar to those in the surrounding sea were found in the upper layer of the cave. Pictured is the inspection site.
After review by Sansha City, Hainan Province and an expert group, the Sansha Coral Reef Conservation Research Institute announced that the proven depth of the "Yongle Dragon Cave" in Xisha is 300.89 meters, surpassing the 202-meter ocean blue hole on Long Island in the Bahamas and becoming the world's deepest known ocean. Blue hole. The picture shows corals and other primitive ecological biota deep in the blue hole.
The Sansha Municipal Government pointed out that the "Sansha Yongle Dragon Cave" has extremely high scientific research value and historical and cultural value, and is a true testimony of the Chinese government and people's long-term persistence in ecological and environmental protection. The picture shows experts using underwater robots to detect the depths of the blue hole.
Original ecological images of the depths of the Blue Hole captured by an underwater robot.
The scientific research vessel conducts research and inspection at the entrance of the Blue Cave.
The picture shows marine experts wearing diving suits to conduct underwater exploration of Sansha Yongle Dragon Cave.
Froggers from the Blue Hole Research Department entered the blue hole to explore inside.
The picture shows the Dragon Cave from a distance.
Source: National Ocean Forecast Station
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