After 32 hours of tackling the ferocious blaze at the Buncefield depot, firefighters extinguished all 20 tank fires, although another broke out again on Wednesday.
The new blaze broke out in a previously undamaged tank. The fire brigade said it would be safer to allow it to burn out.
Three out of 20 tanks were still burning on Tuesday morning and firefighters tackled the blaze in the largest tank last.
The tank fires were finally extinguished on Tuesday afternoon, although some smaller containers were still alight and a previously undamaged tank ignited on Wednesday.
The scaling down of the operation meant some crews could take a break...
...and also allowed emergency workers to take stock of the devastation caused by the blast on Sunday.
Residents who had to leave their homes during the fire have been returning, but face a huge clear-up operation.
The fire's plume of smoke weakened during Tuesday and traffic has moved freely on the M1, although junction 8 is still closed.