About 10 or 15 years ago, the company began using helicopters in the construction industry.
They will also not be able to use helicopters or plant mines.
The team considered using helicopters that could have lowered the 4.7-ton structure into place.
The extreme mountain conditions meant they could not use helicopters.
'We may have to use helicopters,' said an unidentified voice.
This is more than twice the capacity of helicopters usually used in the Gulf.
One of the helicopters used in the operation failed and was destroyed by the special forces before they left.
In particularly difficult terrain, air transportation is now also used (especially helicopters).
The police also uses helicopters for air surveillance and immediate response.
Thousands of people were evacuated by local authorities using military helicopters.