James Cutfield was questioned for more than two hours after the deaths of tech tycoon Mike Lynch, 59, his daughter Hannah, 18, and five others.
Prosecuting magistrates, who spoke to the New Zealander for the second time in a week, said that he had been "extremely co-operative" in answering questions.
Investigators may also interview a crew member who was on watch and survived when the storm hit off Porticello, the Italian press reported.
In Italy being placed under investigation does not imply guilt and does not mean formal charges will follow.
Key crew members have stayed in Sicily voluntarily to help authorities.
Six passengers and chef Recaldo Thomas died when the British-flagged vessel capsized in a freak storm on August 19. The 184ft-long yacht, which had the world's tallest aluminium mast at 246ft, is thought to have been hit by a "downburst".
この記事は Daily Express の August 27, 2024 版に掲載されています。
7 日間の Magzter GOLD 無料トライアルを開始して、何千もの厳選されたプレミアム ストーリー、9,000 以上の雑誌や新聞にアクセスしてください。
すでに購読者です ? サインイン
この記事は Daily Express の August 27, 2024 版に掲載されています。
7 日間の Magzter GOLD 無料トライアルを開始して、何千もの厳選されたプレミアム ストーリー、9,000 以上の雑誌や新聞にアクセスしてください。
すでに購読者です? サインイン
Villa icon was 'real-life superhero' who helped conquer the continent
STAN COLLYMORE hailed the late Gary Shaw as \"a real-life superhero\" and the main reason he started playing football.
'We got Champions League bibs and balls on Sunday... I can't tell you how proud and happy it ano made me'
McGINN LIVING A EURO DREAM
I'm one of the lucky ones' says Margie, 74, after three cancer battles
CANCER survivor Margie Shields says she feels lucky to be alive after beating the disease three times in 20 years.
Where are your eyes, world? Can you not see? People are dying every day
As the Ukraine conflict drags on, a passionate cris de coeur for our ongoing support for the embattled nation. But is its author a politician or soldier? No, she is a 15-year-old girl whose words should inspire us all, writes Lord Ashcroft
Firestorm as missiles hit border city
UKRAINE has pounded Russia's border region of Belgorod in a series of surprise missile strikes.
Putin boosts total soldier numbers by 180k to 1.5m
VLADIMIR Putin has ordered army chiefs to increase the number of Russian troops by 180,000 to 1.5 million.
Man City's defence over finance claims kicks off
THE landmark legal battle between the Premier League and Manchester City over 115 allegations that the club broke financial rules began yesterday behind closed doors in London.
Baby Reigndeer
Stalker hit rises above furore to win 4 gongs
'I will be glad when you gone... suspect's years of Trump hatred
THE alleged would-be assassin of Donald Trump formed a hatred for the former US president - despite voting him into the White House.
Painful proof my pal Esther's fight is right
DAME Esther Rantzen has been my friend, mentor, confidante, companion and let me unleash my true fan-girl here - inspiration for almost 30 years.