About 40 workers were undergoing safety training at the time of the tunnel's collapse, said Freeport's Indonesia subsidiary.
The system allows one train at a time to use the tunnel, in contrast to the several that normally use it at rush hour.
The rows continued as the teams went down the tunnel at half-time with Derry boss Stephen Kenny involved in a heated exchange.
No other workers remain in the tunnel at this time, according to Mack, and no one was exposed to harmful gases as a result of the accident.
Settling into a seat as day turns to night and twilight adds a mischievous element to the ride, with a burst of hooting and hollering breaking out each time the train passes through a darkened tunnel.
Then there was the time a year ago when, in a dark tunnel, the driver of an oncoming car became so unnerved at the sight of Nemitz's lantern-lit coach that he backed up into the wall.
Remarkably you can see the machine move very slowly down the tunnel, a few inches at a time.
Eli Hodapp, editor of a website called The Duke Nukem Forever List, reminds us the Suez Canal, the Channel Tunnel and the Manhattan Project were finished in less time.
At the same time, at the last minute -- they obviously have tunnel vision, it's a very, very stressful situation -- one of them yells out, 'Look out!'
Zamora limped down the tunnel at half-time and, although he came out for the second period, his evening last only seven more minutes.
Villa boss Martin O'Neill showed little respect as he angrily pursued referee Halsey down the tunnel at half-time and his team certainly came out fired-up for the start of the second period.
The Scottish Football Association has begun an investigation into Wednesday's events, but Mjallby played down his own involvement in the tunnel at half-time, when he appeared to clash with Rangers defender Kyle Bartley.
In 1996, when he became prime minister for the first time, Mr Netanyahu's decision to open a tunnel alongside the al-Aqsa compound sparked a Palestinian uprising that left scores dead.
And there was worse news to follow for Wigan when this season's Man of Steel Richards limped down the tunnel five minutes before half time.
People living by the pyramids in Giza told us new tunnels were still appearing all the time, and that on occasions they had even seen trucks parking close to the tunnel entrances in the desert.
"I think for the first time we feel we're extremely close and there really is light at the end of the tunnel, " he said.
But the tunnel he and Steelman use one day may not be there the next time the two venture down.
Though Jack Wilshere's head-shaking trudge down the tunnel suggested otherwise, Wenger didn't believe he would have a hard a time picking up the team for the Bayern game.
My progress down the tunnel ended and I began the long struggle back to consciousness, one level at a time.
He says his economic austerity medicine needs time to take affect and he insists that "there's light at the end of the tunnel".
In 1990, Engineers digging a railway tunnel under the Channel broke through the last dividing rock and joined Britain to mainland Europe for the first time since the Ice Age.
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