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♪ [music] ♪

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>[MAN] This is the Van Veen grab.

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It's a surface sediment sampler
designed for taking samples

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on lake and riverbeds and large sumps.

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It's a stainless steel construction.

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This is a 1/2-liter model.

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They also come in 2, 6, and 12 liters.

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And the way it works is not
dissimilar from a mousetrap.

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We can just set it with this lever here

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and now we can lift the whole unit and
we can lower it through a body of water

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And then, as it touches the lakebed,
it releases, and then we can lift up again,

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and we get a nice, surface sample

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and now we can pull it back
to the water's surface.

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All right, there she goes.

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>[WOMAN] [unclear]

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so maybe it gathered some sediment.

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[unclear]

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>[NARRATOR] Oh, looking good.
It has caught something.

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>[WOMAN] It feels a bit heavier.

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>[MAN] There we go.
>[WOMAN] Yeah.

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♪ [music] ♪