Today was a crucial day for the first week of The Long Swim.

I rounded Lizard Point, the most southerly point in Great Britain and a place renowned for its treacherous waters.

Although things appeared calm on the surface, they were rather more turbulent underneath.

Whirlpools and eddies caused an up-swelling of cold water. The temperature when the swim began was 16C (61F), and when I came out of the water after 79 minutes it had dropped to 12C (54F).

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Although our images show me swimming straight towards the rocks, the tide was actually perpendicular, pushing me 90 degrees sideways.

Big up to skipper Stephen Praetorius, who navigated our craft and me safely through on the morning spring tide.

I have never experienced such strong currents. It was like swimming in a flooding river.

This evening swim then started well - we saw pods of dolphins and a sunfish - but after that it didn't go to plan.

I started swimming on the wrong current, which made me swim even slower than I would have done if there'd been no current at all.

After struggling against counter-eddies for nearly an hour and a half I had covered only a couple of kms.

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I made the call to stop and try again first thing in the morning - a move we had not planned. This means we couldn't motor to Falmouth for the evening to replace our water, power and get food.

We have now run out of water and are on our emergency supply bottles, having anchored in the small village of Coverack.

The plan for tomorrow is to do a swim early to make up for the lost time.

4 miles (6.5km)