How do you beat the torture chamber in Metal Gear Solid peace walker

-mash triangle button in the entire cutscene
-go to the sink to get the jigsaw
-equip jigsaw (item) L+R to use
-unlock the cell gate using jigsaw (be sure you will not get caught because you will go back to start)
-get the prisoner on other cell and escape upstairs

Thanks to deathguyz