Health and Safety at Work inspectors say their investigation into the death of a construction worker in Kirk Michael could take up to six months.
Fifty-five year old Gareth Sowden from Douglas was killed when part of a structure being installed at sewage treatment works on Balleira Road, fell on him.
The accident happened on Wednesday morning - emergency services were called but Mr Sowdon died on-site.
Painstaking inquiries are being carried out to establish whether what caused the tragedy and the site will remain closed while safety procedures on the site are reviewed.
Bernard Warden from the Health and Safety Inspectorate is heading the inquiry:
Figures show cost of works at Ramsey and District Cottage Hospital
Section of former Ramsey Bakery site could become a motorcycle shop
Cyber security event to take place later this year
Warning after drone reported flying over farm
French tall ship returns to the sea