Mi-26T

Mi-26T, the world's best line production helicopter in terms of load capacity, is unrivaled in cost-performance parameters. This type helicopters are intensively used for all sorts of operations: transportation, evacuation, fire fighting etc. Mi-26T is capable of carrying up to 20 tons of cargo inside fuselage or on external sling.
http://www.russianhelicopters.aero/en/helicopters/1830.html