Mariners are advised to keep a good lookout for around 200 wooden planks, which have been spotted 25 miles west of Guernsey.

Guernsey Harbours has warned that given the prevailing weather conditions, the navigational hazard could arrive off the island’s coast within two to three days.

‘Mariners are advised to keep a good lookout to avoid damaging their vessel.’

A spokesman for the Guernsey Sea Fisheries Section said: ‘The wood was lost overboard from the freighter MV Koninsborg whilst en route from Finland to Tunisia.

‘It lost propulsion during the recent storms and the disabled vessel then lost part of the deck cargo and suffered hull damage as it drifted. The salvage tug Abeille Bourbon towed MV Koninsborg to the safety of Brest.’