The antonym of bottomless pit is stepping stone.
A bottomless pit generally refers to a hole or abyss whose bottom cannot be detected. Incoming water or other materials will reach the center of the earth. Scientists speculate that it is a black hole. There are indeed bottomless pits on Earth, one of which is located on the seaside of the ancient city of Argos in Greece. Because it is close to the sea, when the tide is high, the turbulent seawater will pour into the cave like a mountain, forming a turbulent rapids.
According to measurements, more than 30,000 tons of seawater flow into the cave every day. What is strange is that such a large amount of seawater pours into the cave, but it never fills it up. Since the 1930s, people have made various efforts to find its outlet, but all have been in vain. In order to uncover the secret, the American Geographical Society sent an expedition team in 1958.
They dissolved a long-lasting dark dye in seawater and observed how the dye sank with the seawater. Then they looked at the nearby sea and various rivers and lakes on the islands. The results were disappointing. No colored seawater was found. A few years later they conducted new experiments. They created small pellets of light rose-colored plastic.
Throw 1,300 kilograms of this material with a special mission into the swirling seawater. In a moment, all the small plastic particles were like a whole, swallowed up by the bottomless pit. They imagined that as long as one particle popped up in another place, they could find the exit of the bottom pit. However, after mobilizing hundreds of people and searching the waters for a whole year, nothing was found.
Speculations about the bottomless pit
In August 1992, Australia's Columbus conducted a scientific expedition. Scientists believed that the bottomless pit may be an unknown black hole. The black hole may have a huge radiating hole radiating outward from the center. gravitational field, but this still needs further scientific investigation.
Some ancient Chinese books have repeatedly mentioned that there is a bottomless pit overseas. "Liezi Tangwen" records: The east of the Bohai Sea is hundreds of millions of miles away. There is a large ravine, which is actually a bottomless valley with no bottom below it. It is called Guixu. The water of the Eight-nine Wildernesses and the currents of Tianhan and Han Dynasties are all poured into it, without increasing or decreasing.