The moat is apparently connected with the sea. The reports were then taken up by the countrywide media and lots of people turned up to investigate what was in the moat. The water is murky so visibility is limited. One investigator tried to listen with microphones and divers tried to look for the creature. Nothing conclusive was found but some skeptics think it could have been a seal, a big pike or a big catfish (Silurus glanis) that somehow got into the moat. It may have been placed there or got in by itself through the access to the sea.
A large catfish or pike
a modern-day dragon