I looked at the video, the tug can easily pull an aircraft carrier

Guinness Book of Records as the largest and most powerful tugboat in the world

Intersting video about the sister NIKOLAY CHIKER (IMO 8613334): https://www.youtube.com/watch?v=QEnTgo4wT0o
(the music underlining the video is .... well a question of taste)

The ship is equipped with a whole set for performing rescue operations. At the bow is a helipad, capable of taking helicopters with victims 24 hours a day and produce their refueling. To perform underwater work on the vessel has a pressure chamber, diving equipment, underwater cameras, devices to blur the soil, metal welding and cutting underwater metal detectors. "Photius Krylov" is equipped with devices for fire fighting on other ships by means of a flame retardant liquid. Medical Service provided operational and three hospital wards.
The bridge of the vessel is equipped with three remote controls that allows you to manage them if necessary from the right and left sides or from the stern.

4 x Wärtsilä 12V32D, more info:
http://tugfaxblogspotcom.blogspot.se/2012/11/russias-most-powerful.html

http://www.marinelink.com/news/article/40-000-hp-supertug-offered-for-charter/320947.aspx

BRGDS / foggy

Emerging traction power (291 tons) brought in a Guinness Book of Records as the largest and most powerful tugboat in the world. Capable of transporting vessels of up to 250 thousand tons, with 8-point rough sea at a speed of 4 knots, allowing it to handle ships of all types in a wide range of NOAA weather.

4 of diesel engine «Wartsila» - Power 24480 hp

Interesting!!!! How many engines and of what type do you know please Mikhail. Nice looking ship btw and a fine photo of it.
B/ regards Oz