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We use three methods to study hydrothermal plumes
from the ship.
A) Lowering a CTD in a series of vertical “casts.”
B) Raising and lowering the CTD while slowly towing it from the ship,
called a “Tow-Yo.”
C) Towing the Argo-II camera system near the seafloor with sensors,
called MAPRs, placed on the fiber optic cable above it. (See the Hot Topic
on MAPRs for an explanation of these sensors).
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