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The WISP is carried to Europa's surface by the SOM, and then released
into the ice. The probe houses a number of devices inside. The top
part of the probe is a sonic transducer that communicates with the
lander in order to send data back to earth. Below this are the
floatation balloons and inflation system. Still further down, the
equipment bay houses a black-and-white microscopic visible-light
camera, known as MicroWISPCam. It includes a light source. Also, an
alpha-proton-xray spectrometer and a seismic accelerometer are found
in the equipment bay. At the very bottom resides the RTG, which will
provide power for the instruments and the transducer, and produce the
heat to melt through Europa.