More of the slipway at Hemsby was lost during last night's high tide.
The village, which has been battered by the sea for the past 12 years, was on alert following more collapse of the Marrams access road on Monday.
Hemsby Independent Lifeboat coxswain Daniel Hurd raised concerns after the slipway was pulled into the sea, causing the village's offshore service to be temporarily suspended.
The offshore service remains offline.
"We easily lost another four feet from the Gap overnight," said Mr Hurd.
"With tonight's high tide, there's no telling what more damage will be done.
After inspecting the beach this morning (Tuesday), the Lifeboat crew deemed the Gap entrance - with its now 12-foot drop - to be unsafe.
"We worry that someone could get seriously injured at the Gap in its current condition," Mr Hurd said.
"We've informed the council and the ball is now in their court."
Tonight's high tide is predicted to climb over 12 feet before tide levels return to their normal range later in the week.
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