A search-and-rescue operation was started after four divers went missing three-and-a-half miles off Worthing.
The men had been diving when colleagues lost sight of their surface marker buoys.
Crew from the dive boat radioed the Solent Coastguard for help at 5.30pm yesterday.
The coastguard helicopter and three lifeboats from Shoreham and Littlehampton searched for the men.
Two of the men were picked up by the dive boat and the two remaining men were found by the coastguard helicopter.
They were picked up by Littlehampton lifeboat and taken back to Littlehampton harbour, where they were reunited with the other divers.
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