Just like U Thant Island or Belmont Island located in New York, United States. This small island is prohibited from being visited by the general public. Why is that?

The following is the translation of the given 'Bahasa' text to 'English' while preserving any html tags: "Island U Thant is described as a small mound of soil, rocks, and green plants with strange metal scaffolding. Island U Thant, which has the official name Belmont, is taken from August Belmont, Jr. He is the person who financed the construction project of the tunnel under the East River from 1907 to 1940."

The island was formed as a result of excavation of construction tunnels under the East River from 1907 to 1940. Where the remains of excavated soil and rocks accumulated, making it a small island.

The following is the translation of the given 'Bahasa' text to 'English' while preserving any html tags: "U Thant Island or Belmont Island is located in the heart of New York City itself, precisely on the East River. Not many people are aware of it, even though they are American citizens living in the busy city. This is because the island is only 30 x 60 meters in size."

The following 'Bahasa' text translated to 'English' while preserving any HTML tags: "Pulau U Thant cannot be visited by the public. The reason is that this island serves as a sanctuary for migrating birds, including a small colony of the crested tern or double-crested cormorant species."

The tunnel that was built directly beneath U Thant Island has claimed lives. Specifically, in 1906, four workers died in an accident beneath the island. The numerous incidents resulting in casualties have made this island increasingly horrifying and frightening.