An investigation has been launched after a young boat captain was found dead onboard.

Giovanni Marchionni, 21, is thought to have possibly inhaled fumes from a chemical toilet or hull batteries.

He was found on Friday on a boat which was moored at the Marina di Portisco in the municipality of Olbia in Sardinia, Italy.

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His body will undergo a post-mortem on Wednesday as part of a manslaughter investigation launched by the Tempio Pausania prosecutor's office.

Giovanni had secured a job as captain of the boat after its owner and her family set off for a two-week holiday at sea.

He was discovered unresponsive in the tiny cabin of the boat by a horrified marina worker in Portisco, north-eastern Sardinia.

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