[splash] the critical ctd will be deployed over 50 times throughout the expedition.er the world there are boats using instruments just like this. it's a combination of electronic measurement equipment, basically that instrument down below, it will measure temperature, conductivity, fluorescence. and that is paired with this 24-bottle rosette. each bottle is called a niskin. just as we have 24 bottles we have 24 of these release teeth. when we send it over at the beginning each niskin is opened up so that you can have free passage of water through each bottle. student: i just need help with this one. thank you. you want to check all the bells? water's over there. loose: the water sampling equipment that we send over the side, it can weigh as much as two tons. they're out there with hard hats like able-bodied seamen. these are all new experiences for them and we just want to make sure they're getting as much out of it as they can. [splash] [grinding] [popping] narrator: water samples from the ctd can identify the amount of glacier ice melt, measure the release of trapp

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