English: Observations from 22 July to 7 August, 2009. The DO concentration declines from ∼1.5 mg O2 l−1 at the start to ∼0.1 mg O2 l−1 at the end. During this time burrows are created and destroyed, and as DO concentration declines burrowing activity decreases. On multiple occasions you can see small fish swimming around during hypoxia in DO concentrations as low as 1.0 mg O2 l−1. As the DO concentration continues to decline towards the end of the movie, the upper layer of sediment becomes reduced (black in color) and small stringy-white bacteria, likely Beggiatoa spp., can be observed migrating through the sediment to the surface. The below table details, though not limited to, some specific behavioral observations. This movie depicts a sequence of images captured every hour, running at a frame rate of 15 hours per second. The black marks around the image are in cm units; date, time, and corresponding DO concentration for the image is indicated at the top and bottom, respectively. The graph below the image displays the DO concentration for the time-span of the movie, and the blue circle bounces around while the movie is played indicating the corresponding DO concentration. Note that this movie is not comprehensive of all the images captured by Wormcam during the time period and if the exhaustive images and movies want to be viewed please feel free to contact the corresponding author. No. Description. Day; Hour 1. Worm in u-shaped burrow. 22-Jul; 21:00 2. Worm extending body above sediment surface. 31-Jul; 03:00 3. Small fish on surface of sediment (center of image). 26-Jul; 09:00 4. Small fish on surface of sediment (center of image). 28-Jul; 08:00 5. Small fish swimming around in low DO. 28-Jul; 12:00 6. Small fish swimming around in low DO. 29-Jul; 15:00 7. Full body of a worm on sediment surface. 01-Aug; 15:00.