This episode is very similar to Season 6 Episode 11 "Under Fire" from "Castle". In that episode it's detectives Kevin Ryan and Javier Esposito respectively who are trapped underneath a collapsed building after an explosion. They also try to get attention by banging ironbars on metal pipes. At one point in both episodes the sentence (or a derivative) "They don't feel like it's a rescue anymore, it's a recovery!" is said by someone.
"Ku I Ka Pili Koko" translates to "Blood Brothers" in English.