Famous French speleologist and diver Frederic Swierczynski became the first man to ever reach the bottom of Red Lake in Imotski. On May 6th, Frederic Swierczynski hit the bottom at 245 meters, after a four-hour dive. Other than hitting the bottom of the lake, the goal was also to take samples of sediments and water at various depths. The team of scientist placed sixteen coops, fishing nets and trawl line at various depths in order to learn more about the organisms populating the lake. Frederic Swierczynski commented that he had seen a surprising number of shoals of small fish, a local species called gaovica.
Red Lake lies in a deep, roughly circular sinkhole. It is surrounded by almost vertical tall walls from three sides and slanted from the fourth side which collapse
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