This illustrates very well the typical burrowing behavior of Lysiosquillids - first a trench followed by somersaults to to scoop up mud at the bottom of the burrow and depositing as back fill. In soft, cohesive sediments like this, they can quickly dig because they don't need to stabilize the sand with mucus.
By the way, did you notice that the stomatopod lost its raptorial appendage when it stabbed the eel?
Roy
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