Nine people were arrested and a large haul of suspected drugs seized following dawn swoops near Hastings Pier.
Twenty officers took part in Operation Caribou in Bottle Alley, on St Leonards seafront.
It followed weeks of intelligence-gathering by uniformed and plain-clothes police.
Thirty wraps of suspected heroin were recovered after a search by a sniffer dog. Police said they were discovered down the side of two seafront benches.
Sergeant Alan Gates said: "This has been very successful and we are delighted. We have disrupted a lot of criminal activity and we would do it again."
Three women and six men were released without charge on police bail while forensic tests were carried out on the suspected drugs.
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