The fjord takes a turn before opening up in Kertinge Nor, and there lies Snekkeled. In these waters, remnants of a Viking era poleboom have been found. The boom consisted of poles driven into the seabed to prevent ship ingress. There were only a few openings in the barrier so only locals would know how to successfully navigate through the fjord. In this way, the Vikings could determine who had access to the inner fjord. A large, mobilized Viking fleet could be well protected here, but still have easy and quick access to both the Great Belt and Odense Fjord.