Tethers provide an astronaut with a lot of room to move around within the cargo bay. The downfall to tethers is that they are not as easily controlled as the other forms of space walks. Tethers do however allow more body movement than the RMS because you can not move your lower body while on the RMS. Both of these astronauts are connected to the shuttle by tethers. Some operations provide ability to use tethers while other operations do not.

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