Doesn’t that sound like a joke? But this is the case
This is the entrance to a tunnel inside Fort William, Calcutta.
Siraj ud Daula, the Nawab of Bengal, after capturing the fort in 1756, kept British prisoners of war in this tunnel. With so many people crammed into such a small space, hardly anyone made it out alive. So this tunnel got the name “The Blackhole of Calcutta” among the British. That name had gained a lot of notoriety.
In 1915, a scientist named Karl Schwarzschild was the first to make a solution to Einstein’s Field Equations. It was then that the concept of black hole was born in mathematics. But no one took this idea seriously for several years.
At that time, it was believed that such objects could only exist in figures and were unlikely to exist in reality. At that time no one gave it the name black hole. At that time it was called Gravitationally Collapsed Object and Dark Star. Gravitationally Collapsed Objects became very popular in the 1960s.
Scientist Robert H. Dicke compared the object to “The Blackhole of Calcutta” in the sense that so much mass is confined in such a small space that nothing can escape. Later such objects got the nickname of black hole. Today nobody knows about “The Blackhole of Calcutta”. But everyone knows about black holes.