
The Isle of Wight Council is pleading with Islanders to avoid an "extremely dangerous" part of Ventnor Esplanade.
Bad weather and large waves have battered the eastern promenade, the council said, undermining a 25-foot section of the sea wall.
A section of the revetment, just beyond Ventnor Skatepark, was closed last Friday (4).
A site inspection revealed cracking and voiding to part of the coastal defences.
Now, the council has said damage has worsened with two large concrete panels collapsing into the sea during Tuesday's (8) storm surge.
Natasha Dix, the council's strategic manager for environment, said:
"We cannot stress strongly enough the need for people to stay away from the site. The recent storms and high tides have carved out a large void underneath the promenade that extends some 25-feet.
"It would be extremely dangerous for anyone to try to walk along there and we would ask everyone to respect the closure for their own safety.
"We also wish to reassure the community that the area continues to be monitored daily and that we are working closely with the Environment Agency and other partners on immediate remedial works and potential options for the future."