Experts reckon the 260m man-made V-shaped ancient fish trap near the River Teifi at Poppit in Pembrokeshire could be more than 1,000 years old.
The structure is entirely underwater but it is thought it was used when sea levels were lower to catch fish, such as salmon and sea trout, which would be trapped when the tide went out.
Dr Ziggy Otto, lecturer in coastal zone and marine environment research unit at Pembrokeshire College, and Jennifer Jones, a scientific diver have already dived the site.
Ms Jones said the rocks were now covered in worms, algae and sea anemones and acted as a naturally functioning reef.
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