About 27 tonnes of caramelised brown goat cheese -- a delicacy known as Brunost -- caught light as it was being driven through the Brattli Tunnel at Tysfjord, northern Norway, last week.
The fire raged for five days and smouldering toxic gases were slowing the recovery operation, officials said.
The tunnel -- which is said to be badly damaged -- is likely to remain closed for several weeks, they added.
"We can't go in until it's safe," geologist Viggo Aronsen told Norwegian broadcaster NRK.
Norway goat cheese fire closes tunnel