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A couple who stumbled upon a Second World War bomb shelter in their garden while extending their house have converted it into a glitzy bar - after spending a staggering £780,000 on their renovation.

On last night's episode of Channel 4's Extraordinary Extensions, hosted by Tinie Tempah, KJ and Mike revealed how they converted their tired 1930s former B&B in Canterbury into a sleek modern three-bedroom home.

The pair, who embarked on a journey to do a two-storey timber slatted extension in November 2024 had, however, early on into the process realised there was a historic relic in their back yard.

'We came across a little opening, and we kept digging,' Mike told viewers. 'And then we found this entire thing.'

They converted the find into a 'hidden bar' - which can be accessed via a hatch in an outhouse which was built on top of the structure, and is also used as an office and gym space.

'The sensible approach would probably have been to fill it in and forget about it,' KH admitted during the episode, admitting the challenges faced, including the discovery of lead paint after they power-washed the walls.

Elsewhere, the couple also had to deal with the bunker getting flooded - and said that while it's renovated, it's still not entirely watertight, hence they have placed easy to move furniture.

Now however, the space is far from a tired, worn Blitz leftover. The painted red and pink walls invite a warm atmosphere, while a printed carpet provides a soft touch.

On last night's episode of Channel 4's Extraordinary Extensions, hosted by Tinie Tempah, couple KJ and Mike revealed how they spent £780,000 converting a tired old 1930s former B&B in Canterbury into a sleek modern three-bedroom home

A couple who stumbled upon a Second World War bomb shelter in their garden while extending their house have converted it into a glitzy 'speakeasy' bar

They converted the find into a 'hidden bar' - which can be accessed via a hatch in an outhouse which was built on top of the structure, and is also used as an office and gym space

The pair, who embarked on a journey to curate a two story timber slatted extension in November 2024 had, however, early on into the process realised there was a historic relic in their back yard

The couple access the bar via a door in the outhouse they built in the garden

Mike and KJ have placed two chairs and a small side-table next to one another, and a small wooden bar houses drink and cocktail paraphernalia.

Canterbury was heavily bombed during World War II. In the early 40s, and by the outbreak of the conflict, according to Kent Archeology, it had shelter spaces for 1,960 people in basements and 1,540 in 'covered trenches'.

The pair also showed the stunning makeover the extension gave the whole house, going from a tired 30s property to a stunning new build which stylistically combines both their heritage, blending Norwegian and Korean interiors.

Pale Scandi cladding now sits comfortably against the original brickwork, and they installed bold orange-framed floor to ceiling windows.

The home is also now full of 'hidden' tech, including secret, voice activated blinds and subtle lighting on the stairs.

The extension houses a stunning open plan living room, dining area and kitchen, opening straight into the terrace - covered by a pergola which 'gives a nod to Korean gardens'.

It also made space for a stunning new master bedroom. The couple, who set aside £700,000 for the project, were about £80,000 over budget.

The biggest extra cost came from having to retile the roof after they discovered an issue with it, which set them back £25,000.

Canterbury was heavily bombed during World War II. In the early 40s, and by the outbreak of the conflict, according to Kent Archeology, it had shelter spaces for 1,960 people in basements and 1,540 in 'covered trenches'

The pair also showed the stunning makeover the extension gave the whole house, going from a tired 30s property to a stunning new build which stylistically combines both their heritage, blending Norwegian and Korean interiors

The home is also now full of 'hidden' tech, including secret, voice activated blinds and subtle lighting on the stairs

'You've juggled a huge build, big design choices and a bomb shelter on the side,' Tinie said. 'Was there ever any point in the process where you thought - we've bitten off more than we can chew?'

'Well, probably!' KJ said. 'It's just been exhausting at times.'

Mike added: 'You have to look at the end product... the journey has its highs and lows but it's come together!

'We knew going into this that we wanted to create something that's a reflection of both of us.'

'This is deeply personal,' KJ added.

Elsewhere last year, one couple discovered a World War II Nazi bunker marked with ominous phrases under their home, after excavating their entire garden to uncover it.

Shaun Tullier, 35, and his wife Caroline, 32, uncovered the shelter lying 26ft below their house on the island of Guernsey years after moving in in October 2021.

After removing more than 100 tonnes of soil from their front garden, they were eventually met with an eerie staircase leading down into two large rooms and a hallway.

There were even a number of German phrases left on the walls of the base, including one reading 'achtung feind hort mit' - which translates to 'beware, the enemy is listening'.

The couple decided to turn it into their own games room complete with a snooker table and a gym.

They had been aware the property had been used as a German gun emplacement but they always wondered if there may be more hidden below the surface.

These sorts of wartime structures were left behind after the German forces occupied the Channel Islands from 1940 until 1945 and, under Adolf Hitler's orders, turned the the islands into an 'impregnable fortress'.