What are you scared of? I guess we don’t know the answer until we’re faced with something that makes our stomach turn upside down.

I love swimming but a few days ago we tied up in a little harbour after a long sail and walked along the quay to the beach. The water was crisp and clear and you could see right down to the sloping white sand below. We both plunged in to cool off.

“Wow!” came the exclamation, “that’s deep!” The skipper a few metres further out than me, pointed below. I stuck my head down and saw a steep bank of sand disappearing into blue and deeper blue and more blue! The steeply shelving beach had the feeling of stepping off a precipice. My stomach did a tumble as I back paddled away.

We can both swim well and in deep water, but there was something different about this, like standing close to a cliff, as if I was suspended above the drop. Neither of us felt keen to venture over the drop which we called “the deep”. It was quite ridiculous considering we’ve jumped into the sea mid sail hundreds of times in much deeper water and felt fine.

After our trip to the beach we met a Greek sailor who told us some of the secrets of this hidden harbour on the south of Halkidiki’s middle peninsula.

He told us it had been a secret submarine base during the Second World War. The deep natural harbour with its hidden entrance between the cliffs had even had a metal net across the entrance to stop enemy boats getting in. All around the surrounding hills had been huge canons standing watch. He said one of these now lay on the sea bed below.

The story of the submarines somehow confirmed my deepest fears of something unknown lurking unseen below, a bit like the Loch Ness monster!

After a few days sailing around the peninsulas, we returned to Porto Koufo yesterday and went back to the beach.

“Let’s go into the deep,” I said.

“Do you want to?”

“Yes we have to face our fears!”

We laughed and both put our heads down and headed out. Through my goggles I could see the sand slipping away and the blue below becoming bluer. We both looked up and trod water – no giant squids snapped at our toes, no monsters bared their teeth below us. We were still OK. Nothing to be afraid of really! Still after a few minutes we headed back to the safety of the sand and enjoyed the feel of something solid between our toes.

Last night in the restaurant we heard more stories from would-be psychology student, 17-year-old Nicole, our waitress for the evening. Her grandfather had set up the first Taverna here after the war. There were tales of bombs being made in a cellar and tunnels in the hillside where you can still see the remains of the Nazi control rooms.

This is a place of history and beauty. We love the ramshackle quay, with its huge metal bollards for ropes, the fishermen waiting patiently all night by their rods and feeding stray cats with the unwanted catches.

Tomorrow we will leave Porto Koufo and “the deep” behind us to make the passage back to the Sporades islands. We will be heading into another kind of “deep” hoping for fair winds. The unknown is always a little scary, whether it’s new places or fresh challenges. I get a little nervous each time we come into a new anchorage or port, uncertain how we’ll do tying up or getting our anchor set. But each time we swim over the edge and face the fear we get a little bolder and braver, hopefully!

Although facing my fears doesn’t help me being rubbish at lassoing ropes over bollards ( Thank you to the old sailor who helped us tie up yesterday, reassuring me as I ‘misthrew’ the rope yet again, by saying, “Slow, slow, slow, no rush – we sailors have all the time in the world”! ) I should have taken his advice this morning too as I rushed up the boat steps for the umpteenth time and tripped re grazing my shin, all before breakfast! My body is now tattooed with the stories from this trip, a selection of tell tale bruises, scars and mosquito bites.

Listening to the wind whistling through the mast today, I am sure there will be more to come!