Terrific!
How did they measure so deeply? In a cave at such a depth it is extremely difficult and dangerous to operate even a remote device. I took part in the expedition of the Russian Geographical Society where an attempt was made to examine the bottom of the lake in the Caucasus. Even with the most sophisticated equipment, they could not move farther than 300 meters into the depths. In this miracle, one of the devices was not lost.
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Hi! I am glad you did manage to read the post. That is definitely something of your interest:).... they did manage to dive to a certain depth but then used the remote devices to explore further down... The expedition was done in the cooperation with Polish divers. Have a great night. Tomas