Charles Kneen Keggin, known as Charlie, died at the Global Doctor International Medical Centre in Jakarta on August 24.

The 18-year-old's body was repatriated to the Isle of Man last week and an inquest into his death held on Tuesday at Douglas courthouse.

>> Teenager killed while visiting parents in Indonesia

In a statement the teenager's father, James Keggin, said Charlie had one foot in the pool in their back yard in South Jakarta, Indonesia, when out of curiosity he decided to investigate what was inside a cement box at the edge of the pool. Charlie reached into the box, took hold of some electrical wires and started to fiddle with them, the inquest heard.

He was immediately electrocuted and unable to let go and when Mr Keggin tried to free Charlie he received an electric shock.

Mr Keggin, a geophysist for BP, pulled Charlie free from the cables and the water by grabbing hold of his shorts. Along with a medic from the Global Doctor International Medical Centre, Mr Keggin spent 30 minutes trying to revive Charlie at the scene. Further attempts were made when he arrived at the medical centre but to no avail and Charlie was pronounced dead.

Indonesian police visited the scene and following an external examination of the body were satisfied an internal autopsy wasn't required and that Charlie's body could be repatriated.

Dr Sajid Nasir, of the Global Doctor International Medical Centre, said the cause of death was due to cardio-pulminary arrest and electrocution. He issued a death certificate to that effect and described the death as accidental.

Following the repatriation of Charlie's body, a post-mortem examination was carried out at Noble's Hospital, Braddan, by Dr Christopher Clague on August 28.

He said death was due to electrocution as a consequence of external grounding of current through the body while partially immersed in water.

The inquest heard that the voltage of the current supplied to the jacuzzi box was likely to have been 240 volts.

Deputy Coroner of Inquests Alastair Montgomerie praised the valiant efforts of Mr Keggin in attempting to save his son.

Recording a verdict of accidental death, he said: 'While I appreciate that no amount of words can suffice, I wish to extend my deepest sympathy to the deceased's family and friends for the great loss they have suffered.

'The word tragedy is sometimes overused – not in this case. Charlie, as he was known, had just successfully completed his International Baccalaureate at King William's College and has his whole life ahead of him. He was very popular with both fellow pupils and staff. in the sixth-form year book for 2008 Charlie wrote that he intended to retire by the age of 30 – I have little doubt that he would have succeeded.'

Following the inquest, the outgoing principal of King William's College, Philip John, paid tribute.

Mr John said: 'This is a huge tragedy, which has deeply saddened and shocked everyone at King William's College. Charlie was a very bright boy, and had a very bright future ahead of him.

'Our thoughts are with his family and friends at this sad time – it must be very sad for all of them.'

Charlie, of Corlea Road, Ballasalla, leaves parents James and Sarah, siblings Thomas and Georgie and grandparents Ken and Jean Cooper and Evelyn Keggin.

His funeral takes place tomorrow (Friday) at 11am at the Chapel of St Thomas, King William's College, Castletown, followed by internment at Rushen Churchyard.

Donations in lieu of flowers can be made to the World Land Trust.

www.justgiving.com/charliekeggin