Thales Underwater Systems or TUS (formerly Thomson Sintra ASM, Thomson CSF DASM and then Thomson Marconi Sonar) is a subsidiary of the French defense electronics specialist Thales Group. It was created in 2001 and belongs to its naval division. It specializes in the development and manufacturing of sonar systems for submarines, surface warships and aircraft, as well as communications masts and systems for submarines. Its headquarters are located in Sophia Antipolis, France.
Thales Underwater Systems is made up of three branches: TUS SAS in France with sites at Brest and Aubagne (PONS); TUS Ltd in the United Kingdom with sites at Cheadle Heath and Templecombe; and finally TUS Pty in Australia. It nonetheless operates as a single company.
The company had annual sales of €400 million in 2006 and employed around 2,100 people.