In Russia in the village of Roslyakovo (Murmansk region) during the fix and modernization of aircraft-carrying cruiser "Admiral Kuznetsov" sank the world's largest floating dock PD-50.
The aircraft carrier had been exiting the dock when the incident occurred, state media TASS said, and the vessel is sheltering at the 35th Ship Repair Plant.
Maria Kovtun, Murmansk's governor, said in a statement that a rescue operation had been launched and 71 people evacuated after the floating dock holding the ship had begun to sink.
The corporation's chief, Alexei Rakhmanov, said the 70-ton crane left a hole of 20 square meters (215 square feet), but added that it didn't damage any of the ship's vital systems.
Earlier, TASS reported that four people injured in the incident were being treated for hypothermia.
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Such continued attacks on Kurdish positions, the statement said, "would cause a long-term halt to our military campaign". Erodgan recently increased threats to launch a major offensive against Syrian Kurdish fighters near the Euphrates River.
"We assess the extent of damage". The accident caused damages to the vessel and injuries to four ship fix plant workers.
Floating dock PD-50 was built in Sweden in 1980, ordered by Soviet Navy and designated for the repairs of the biggest Navy ships, including air carriers and biggest nuclear submarines.
On October 29, Murmansk experienced electrical supply interruptions when snow and ice damaged power lines, the report stated.
The Russian government has set up a commission into the sinking of the dock, investigating both the cause of the accident and whether the structure should be lifted back to the surface.
The aircraft carrier had been in dry dock for total overhaul slated to finish in 2020 after a disastrous deployment to support Syrian President Bashar Assad saw it lose multiple aircraft into the Mediterranean and bellow thick black smoke throughout its journey.