Mr Whyte, one of three Australians to appear before the commission yesterday, was also deeply troubled to find a large auxiliary fan had been placed at the portal.
It was completely incomprehensible that someone would force fresh air into a mine that had just exploded, he said.
It is akin to blowing on a smouldering fire to cause re-ignition of combustion.
In fact, Pike River intended to use it only if it could be proved the mine was not burning. But positioned 2km from the outlet, it would be unlikely to work, Mr Whyte said.
The only indicator of mine ventilation was a piece of plastic tape attached to a rib bolt at the portal of the mine.
The Australians learned the mine had "breathed out" - expelled air - twice the day before and he found it inexplicable that Queensland Mines Rescue had not been told that by Pike River management as they prepared to install the GAG machine.
Police were told to ensure mine management start sharing information and providing assistance or they would return to Australia.
They should not have to chase mine atmospheric readings all the time, Mr Brady said.
There were problems from the moment they arrived one week after the November 19 explosion. There was no one to induct them, so they had to familiarise themselves with the mine site, including establishing where the 'no go' zones were, finding tape but no barriers around the portal.
Subsequently a police officer was stationed there.
There were no self-rescue apparatus for people around the portal, in case another explosion spewed out noxious gases.
Earlier yesterday, the commission heard there was probably no window of opportunity immediately after the explosion to rescue the men.
Many people have cited the Strongman Mine disaster of 1967 as an example of a window of opportunity, a safe period after the first blast when a dangerous mix of fuel and oxygen had largely been used up.
Chemist and gas expert Darren Brady, from Australian company Simtars, said: "The atmosphere could not be defined as safe for re-entry, which means that the opportunity to re-enter did not exist."
New South Wales Mines Rescue and Coal Services Pty Ltd manager Seamus Devlin said he believed the 29 men underground would have walked out if they had survived the initial explosion.
Given the lack of information, the decision not to mount an immediate search was correct, he said.
He likened the main tunnel to a gun barrel.