A winch on a marine research vessel lifts a deep-sea robotic submersible vertically through a distance of 680 m680\text{ m}680 m towards the ocean surface.
The mass of the submersible is 1400 kg1400\text{ kg}1400 kg.
The gravitational field strength is 9.8 N/kg9.8\text{ N/kg}9.8 N/kg.
Calculate the increase in gravitational potential energy of the submersible.
Give your answer to 2 significant figures.