The speed and accuracy was impressive and something the whole crew took pride in

Lieutenant Commander Jason White RN

They committed 21 ships and four aircraft, using some technology the RN either no longer or never has: minelayers, minesweepers and aerial mine disposal teams.

The minesweepers got down to their mission: cutting mines free from the seabed as they steamed up and down their tracks.

That left mines drifting in the ocean, so divers fast-roped out of helicopters into the water to neutralise the floating bombs - a rarely-practised art.

Meanwhile, JS Uraga was laying a fresh minefield. It's Japanese doctrine to carry out defensive mining in their own waters, so the precision with which they lay the mines is vital. She dropped 18 mines in just 30 minutes as she moved around the exercise area at 18kts.

"The speed and accuracy was impressive and something the whole crew took pride in - they even switched over the TV from the evening movie to watch the mines slide from their rails," said Lt Cdr White.

He then jumped ship to join the new minesweeper JS Hirashima and watched the Japanese performing the British observer's favourite task: hunting mines.

"Some things took more getting used to than others. Most meals consisted of miso soup, white rice and some meat or fish with pickled vegetables," he said.

"One key tip passed between divers was the pleasure of milk in tea and dunking biscuits, something the Japanese seemed to take to with some relish."

As for the war-fighting side of the exercise, Lt Cdr White returned to the RN divers' base at Horsea Island impressed by Japan's sailors, their ability and their equipment.

Mine Clearance Diver

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