Nerys Sanders, coastguard watch assistant at Swansea Coastguards, said staff at the base near Mumbles lighthouse first saw about 60 or 70 of the dark blue-grey whales about half a mile from the shore.

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The 59-year-old is believed to be wearing a dark green or grey puffa-style jacket and is possibly wearing walking boots.

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He is described as Asian with short dark hair, wearing a grey T-shirt, black trousers and white shoes.

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The other man was wearing grey trousers and a dark-coloured jacket.

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He was wearing a light grey V-neck woollen jumper with a white T-shirt underneath, black baggy jeans and dark shoes.

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