Photo of a beach, taken from a balcony above. There are (mild) waves breaking all along the shore, excerpt for a corridor right on the middle, maybe 20 metres wide, with no breaking waves, no seafoam etc. The person who made the photograph has drawn a big circle around round this corridor to emphasize it. It *looks* like this should be safe. It's not! This is a rip current. It will pull you very forcefully out to sea. It's dangerous to fight against it. Just go with the flow (literally), let it carry you out a bit, then swim across it, parallel to the shore, and you will soon be out of it.
https://cdn.masto.host/mastodonie/media_attachments/files/110/605/460/648/190/784/original/2b4a2aa0ee251185.jpeg