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A Hull man hoping to become the first person to complete an unbroken walk around the world is planning a 186-mile (300km) swim across the Caspian Sea.
Karl Bushby set off in 1998 and is more than two-thirds into his 36,000-mile (58,000km) adventure.
However, he said tensions between the West and Russia and Iran have meant the only option open to him if he wants to continue is to swim from Kazakhstan to Azerbaijan.
The ex-paratrooper said: "This is the best route, because it's the only viable route. Failure here would be crippling."