Miriam Margolyes, who lives in St Margaret’s, has written directly to the DHB to plead for the board to stop this “dangerous enterprise”.
She said: “I own a house on the cliff top at St Margaret’s Bay and we already have to face terrifying cliff erosion.
“It seems you have no sense of what damage your project will cause to local people and to the environment.
“I would like to place on record my profound disgust at this brutal application and urge you to drop the whole idea.
“I’ve always believed in the harbour board until now and have defended the docks and the people who try to earn their living here in the depressed South East, but this is a dangerous and appalling project, which will threaten the whole coastline.
“You have become destroyers of what makes this area so wonderful.”
She said her objections were based on the sea life that could be destroyed or negatively affected, including 350 grey seals that would be disturbed by the noise and vibration and the impact on their food source.
She claims lowering the seabed could cause coastal erosion and leave sea defences less effective.
Ms Margolyes also said that the buried wrecks of the Admiral Gardner and possibly a German U12 submarine and the remains of Battle of Britain planes and pilots could be disturbed and desecrated.