A 20-year-old apprentice has died while working inside an open-ended tank at a Cranbourne West business.
It is believed the man was working with power tools when he was overcome with fumes in the confined space, about 10am.
WorkSafe is investigating the incident.
The death brings the number of workplace fatalities for the year to 21, compared to 20 at this time last year.
Public enquiries: Call the WorkSafe Advisory Service on 1800 136 089 between 8:30am and 5pm Monday to Friday, email firstname.lastname@example.org or write to Advisory Service, PO Box 4306, Melbourne, 3001.