A member of the Australian Defence Force is in custody after a routine inspection at a Victorian naval base found hazardous materials in a residential unit.
The HMAS Cerberus base has been locked down while the bomb squad searches the unit.
A 400-metre safety zone was declared around a unit at the naval training base on the Mornington Peninsula on Thursday.
A police bomb squad will search the unit.
"A routine inspection this morning of on-base accommodation in HMAS Cerberus has resulted in hazardous material being located in a residential unit," a Defence statement said.
"Victoria Police are in attendance and a Defence member is assisting them with their inquiries."
Police said the search turned up a number of items, but they were unable to say what the hazardous materials found in the unit were.
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