The Vuosaari shipyard was built in 1971–1974. The new dry dock was wide and deep, but only long at first. However, during the construction it was decided to lengthen it to due to the growing demand of large crude oil tankers, making it the longest dry dock in Finland. Blocks weighing up to 500 tons could be constructed in the production halls and lifted to the construction basin with four 150-ton cranes. When the new shipyard was opened, Valmet also moved its two floating docks of 5,000 and 12,000 tons, used for maintenance and repair docking of smaller vessels, from Katajanokka to Vuosaari. An intermediate gate was built in 1984 so that part of the shipyard could be flooded while the other part was used for docking.