I thank you for Eduardomaza thanks to you I already learned something else. Although I continue in Limbo but I have suspicions that you refer to the divers, so they call it in Mexico, but I'm not sure.
Jose Jose Takis are small base-shaped elements or as the chess alfil Install them loaded or preloaded to avoid this noise that occurs and that scares a lot hahahaha, but it doesn't matter or not, I usually charge them before putting them.
Thank you very much Kikemec, already investigated and indeed here in Mexico we call them hydraulic divers, sometimes we call things among countries, we call them a little different and sometimes one wave is taken out.