The Manx government-funded scheme at Princes Half Tide Dock has doubled in price since it was first started in 2019.
He said the project could take two or three years before it is open to the public, but they wouldn’t know until they started work in January.Mr Bowerman said the caves were part of his upbringing – along with his brother Jacob, 27, and sister Evie, 23.
“We’ve lived on the site since 2003. We had a normal life before the cave. We lived in Alnwick in Northumberland, and then my parents said ‘we’re moving to a cave’ I was terrified to go down originally.“They wanted to move back to Yorkshire – my dad was a plumber and mum was a children’s nurse - they saw a newspaper advert for the caves and bought them.”The family home is attached to the site and since he graduated with a psychology degree, Mr Bowerman has been helping run the family business.
“I was happy to come back from uni and help the family push it forward."Mum’s now getting to the age where she wants to take a step back,” he said.
The limestone caves were discovered by lead miners in the 1860s and have been privately owned ever since.
In the future, Mr Bowerman said he wanted to install new lighting in the caves and expand the visitor centre.She said: "Having a sense of purpose, enjoying the great outdoors, and working alongside others have all been shown to enhance mental health, happiness and overall wellbeing.
"Meeting at Grandes Rocques, everyone is welcome to join in – just be sure to dress appropriately, and the Clean Earth Trust will provide buckets and litter pickers."The group will meet at 13:00 GMT with the beach clean expected to last for about an hour.
Organisers said mental health first aiders were available to offer support and advice if required but there was no obligation to chat.They said: "These gatherings are set to become a regular fixture, offering an uplifting way to connect with others while contributing positively to the local environment."