Yokohama pidgin was used in the port of Yokohama in the 19th century. Arimasu was widely used. Another pidgin arose when United States Air Force airmen were in Hamamatsu in the 1950s and an English-based pidgin quickly emerged. Hamamatsu pidgin was used in places of work, amusement and accomodation of Americans in the city. Pidgins don't last long.
Nobody speaks Hamamatsu pidgin or Yokohama pidgin anymore.
We have to care for it and protect it. Well, language is also part of our surroundings. And maybe it's useful to look at language like one biological species in the environment. In actual fact, hundreds of Amazonian languages in South America have disappeared because the forest has disappeared and communities have disintegrated. The issue's quite complicated.