Figure 2. Gas was injected through a capillary (red) into a mud sample (transparent in image).  The gas formed a series of oblate spheroid shaped bubbles.  The bubbles or gas voids bounded by mud are separated from each other by infaunal burrows (tubes), which served as conduits for the gas. The bubble closest to the capillary was formed first, then the bubble that is connected to two burrows at its base.  The third bubble is connected to the second bubble by a horizontally aligned burrow.  In each case the bubbles form by fracturing the sediment.  They are ~2 cm in diameter and 3 mm thick.  The sample is 6 cm in diameter and the image resolution is 120 micrometers.

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