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Submarine Rescue Exercise at RIMPAC 160713-N-GW536-005.jpg
The LR-7 being retrieved by Changdao during RIMPAC 2016.
Class overview
BuildersPerry Slingsby
Operators People's Liberation Army Navy
Preceded by35-ton deep-submergence rescue vehicle
In service2009 - present[1]
People's Republic of China
In service2009[1]
General characteristics
TypeDeep-submergence rescue vehicle
Displacement38 tons (full)[2]
Length9.6 metres (31 ft)[1]
Beam3.2 metres (10 ft)[1]
Draught3.4 metres (11 ft)[1]
Installed powerLead-acid batteries[1]
  • 2 x electric motors (26.8 horsepower (20.0 kW))[1]
  • 4 x tilting side thrusters (16 horsepower (12 kW))[1]
Speed3 knots (5.6 km/h; 3.5 mph)[1]
Capacity18 survivors[1]

The LR7 is a deep-submergence rescue vehicle (DSRV) of the People's Republic of China's People's Liberation Army Navy (PLAN). It was built by Perry Slingsby of Britain and is a development of the LR5 DSRV. The LR7 entered service in 2009.[1]


In 2000 and 2001, Chinese representatives attended international submarine rescue conferences and exercises. This may have followed the 1995 accident suffered by Chinese submarine 361 while surfaced leading to the deaths of the entire crew. China entered negotiations to purchase DSRVs fropm Britain or Canada[3] which may have resulted in the order for the LR7 through Rolls-Royce Marine.[2]

The LR7 was tested in Loch Linnhe, Scotland, in September 2008. It was delivered[2] and entered service in 2009.[1]

The Type 926 submarine support ship was developed to deploy the LR7. The first was laid down in 2007 and entered service in 2010.[4]


The LR7 may operate at depths of 500 meters and may dock with submarines with their bows 60 degrees up.[1]

The DSRV is has a Scorpio 45 remotely operated underwater vehicle with a 1000 meter umbilical. The ROV is used to locate submarines, clear obstructions from escape hatches, and replenish life support stores.[1]


  1. ^ a b c d e f g h i j k l m n o Saunders 2015, p. 159.
  2. ^ a b c Wertheim 2013, p. 114.
  3. ^ Bussert, James C. (December 2003). "Chinese Submarines Pose a Double-Edged Challenge". SIGNAL. AFCEA International. Archived from the original on 11 March 2007. Retrieved 1 October 2022.
  4. ^ Saunders 2015, p. 165.


  • Saunders, Stephan, ed. (2015). Jane's Fighting Ships 2015-2016. Jane's Information Group. ISBN 978-0710631435.
  • Wertheim, Eric (2013). The Naval Institute Guide to Combat Fleets of the World: Their Ships, Aircraft, and Systems (16 ed.). Annapolis, Maryland: Naval Institute Press. ISBN 978-1591149545.