The conductivity, temperature, depth sampling package (CTD) getting ready to be deployed from the ship. The sampling bottles are affixed to the outside of a suite of instruments and the entire package is deployed on a conducting wire, providing real-time data on ocean physics and chemistry as the package descends and ascends through the water.
Deploying the CTD
Image courtesy of the DeepCCZ expedition. Download larger version (jpg, 5.1 MB).

The conductivity, temperature, depth sampling package (CTD) getting ready to be deployed from the ship. The sampling bottles are affixed to the outside of a suite of instruments and the entire package is deployed on a conducting wire, providing real-time data on ocean physics and chemistry as the package descends and ascends through the water.

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