A rusty space hatch that closes. There were three sounds used to make this. The first rusty hatch close sound is sound is Epic Metal Gate.flac made from the amazing qubodup! The second metal hit sound is kung-fu » frying pan.mp3 made from the epic fighter Taira Komori! And the third valve turn sound is Valve Turning- Water Rushing 2.wav made from the genius with good attention skills GoodListener! Thanks for you sounds guys! Good night!