For Bush and Prana Biotechnology, the new data is a sign that there might be a light at the end of the long tunnel they are slogging through.
The Department of Transport said a sale will only be made to "a public body" able to take on the maintenance of the mile-long tunnel.
At over a mile long, the Combe Down tunnel will be the longest cycling tunnel in Britain and will feature an interactive light and sound installation.
The deadliest tunnel-fire incidents happened in 2001 in the 16.9 kilometer-long (10.5 miles) Gotthard tunnel when a crash involving two trucks caused a fire in the tunnel, killing 11 people.
This showed that the propensity to build a long entrance tunnel and build an escape tunnel are genetically separate.
While the rooms are thoroughly modern, the entrance to the property is through a long stone tunnel that remains just as it was 400 years ago.
The 1.7 mile-long (2.7km) Butterley tunnel, which carried the Cromford canal, was opened in 1794 and closed in 1900 after a partial collapse.
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The tunnel is around 7 miles long and designed especially for high speed, underground transit.
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The Brooklyn-Battery Tunnel links Manhattan with the borough of Brooklyn, which is on Long Island.
The two species of mice were successively bred, and those hybrids built long, two-tunnel burrows like oilfield mice - showing that the behaviour is a "dominant" trait.
My progress down the tunnel ended and I began the long struggle back to consciousness, one level at a time.
First conceived nearly one-hundred years ago during the reign of Russian Tsar Nicolas II, the BST would be the longest tunnel in the world - over twice the length of Europe's 30 mile long "Chunnel" linking Britain and France.
Rick Suhr has connected two steel Quonset huts, one with a long, narrow tunnel measuring 100 feet for the run-up.
The Long Island Rail Road evacuated its West Side Yards and suffered flooding in one East River tunnel.
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The central aisle of an airliner, the back seat of a car (stale popcorn crammed into cushion cracks), a coal mine, a hospital waiting room, a long tunnel in which a hot breeze blew first in one direction and then the other.
The twin-bore Sasago tunnel is an estimated 4.3km (2.7 miles) long and is on one of the major highways out of Tokyo.
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