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Emergency crews including a coastguard helicopter were launched in search of a person believed to have walked into the sea.
The coastguard was called at 6.20am by a person concerned for the welfare of someone they saw in the water on the beach near the Tesco in Sheerness.
The RNLI lifeboat, the Sheppey coastguard rescue team and Kent Police joined the coastguard helicopter in a search of the area.
No-one was found and the sweep of the coastline was called off at about 8.15am.
Coastguard maritime operations controller Kaimes Beasley said: "If any member of the public sees a person they think is in need of assistance they need to call 999 and ask for the coastguard."