An interesting characteristic of these lightweight, stockless anchors is that they dig deeper the longer they remain set. I had one go so deep after lying in hard sand for nine days that I had to cut the rode in order to leave. I later returned with fins, snorkel and camp shovel. Using the cut-off line as a guide, I started digging. After an hour’s steady shoveling, I gave up hope of retrieval. It’s in Beijing, I’d bet. In muddy ground, it would have gone deeper sooner. The moral? This badgerlike ability might be a comforting feature during a long weekend, but it can be a problem if you plan to spend a week in the same spot.