Before revision: Rogue holes have been replicated in experiments using water-wave tanks but have not been confirmed in natural bodies of water .
After revision: Although it is often claimed that rogue holes have never been observed in nature despite replication in wave tank experiments, there is a rogue hole recording from an oil platform in the North Sea, revealed in Kharif et al URL The same source also reveals a recording of what is known as the 'Three Sisters' .