FIRE ISLAND - Concerns are growing on Fire Island after Superstorm Sandy caused a breach to grow bigger.

Coastal Geologist Aram Terchunian says Hurricane Sandy caused the breach to quadruple in size. Terchunian says the breach now lets in millions of gallons of water during every tide, and the gap will limit the barrier island from protecting the mainland from flooding.

Terchunian says the breach must be closed, but the cost of dredging could set the county back by as much as $15 million.

Environmentalists say the breach shouldn't be closed because it is flushing out the Great South Bay, creating cleaner water.