Tourism pressure


Underwater wave action created by the overuse of motor craft can put archaeological underwater sites in danger by causing erosion that is difficult to manage. Also highly problematic are buoys and ships whose anchor chains if installed incorrect, tear deep holes in the archaeological layers. For this reason, anchoring has been banned at several places.

Scuba divers must also be mentioned as a potential threat to underwater sites. If uninformed, they can cause damage to sites e.g. by dislodging posts or recovering objects from the lakebed. In Switzerland, Austria or Bavaria are offered special courses to sensitize hobby scuba divers to the fragility of the sites.