Skegness Coastgard and RNLI were tasked by the Humber Coastguard yesterday to respond to reports of a person struggling some distance out at sea.
But the crews were met with a surprise when they went out to locate the ‘person’.
A spokesman for the Coastguard said: “Once on scene we spoke to the first informant who thought they saw a person struggling in the sea.
“RNLI was also tasked to search the shoreline.
“After a thorough search it was established that the person was in fact a large seal.”
The Coastguard said it was a ‘good call’ by the member of the public, adding: “As always, if in doubt, give us a shout.”