How do clamshell snappers collect samples of surface seafloor sediment?

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Clamshell snappers are a type of grabbing device used in undersea exploration to collect small samples of superficial seafloor sediment. These devices are constructed with jaws that are closed by heavy arms, which are actuated by a strong spring and lead weight. When the device makes contact with the seafloor, this mechanism triggers the jaws to snap shut, trapping the sediment inside.1