This bottomless pit is located on the seashore of the ancient Greek city of Argos. It leans against the sea, and whenever the sea is at high tide, the surging sea water will rush towards it like an avalanche.
It flows along the edge of the cave, forming a particularly turbulent rapids.
It is speculated that more than 30,000 tons of seawater flows into this bottomless pit every day. Surprisingly, so much seawater "sprayed" into the hole, but it was never filled. Therefore, people once doubted whether this bottomless pit would be like a funnel, shaft or sinkhole in limestone area. No matter how much water there is, it can't be filled. However, funnels, shafts and sinkholes in this terrain will have exits, and water will flow out along the exits. However, people searched many places and made various efforts in the bottomless pit of the seashore in the ancient Greek city of Argos, but never found its exit.
1958, the American Geographical Society sent an expedition to the seashore of the ancient Greek city of Argos, trying to uncover the secret of this bottomless pit.
The team members adopted this method: they first put a durable dark dye in seawater, and then observed how the dye flowed into the bottomless pit with seawater. Then, the team members quickly went separately to observe the nearby sea surface and the rivers and lakes on the island to see if there was any seawater dyed with this dye. However, the team members made great efforts to check all the places and found no seawater dyed with dyes.
Strange, what is this? Is the amount of seawater too large and the dilution of colored seawater too light for people to see at all?
The explorers had to go back. However, they have been reluctant. A few years later, they developed a light rose plastic particle. This plastic particle is slightly lighter than seawater, and can float on the water surface without sinking and will not be dissolved by seawater.
On this day, the team members came to the bottomless pit by the sea in the ancient Greek city of Argos. They poured 130 kg of plastic particles into seawater. Before long, these plastic particles flowed into the bottomless pit along the sea water. The team members think, "Now, even if only a plastic particle pops up in other places, we can find the outlet of the bottomless pit and uncover the secret of the bottomless pit."
However, what is the result? The expedition mobilized many people and searched for 1 years in various waters, but no plastic particles were found.
So, where did so much seawater flow into the bottomless pit? Where is the hole of this bottomless pit? Until now, it is still a mystery!