MSM-1
MSM-1 USEL (Unità di Soccorso E Lavoro - Rescue and Work Vessel) was a deep-submergence rescue vehicle (DSRV) that was rated to dive up to . It was built by Cantieri Navali Ernesto Breda/Fincantieri for the Marina Militare. The sub was capable of descending to below the surface and could carry 8 passengers at a time in addition to her crew. "MSM-1 USEL" was hosted by mother ship at La Spezia from 1980 to 2002. That year "MSM-1 USEL" was replaced by the DRASS Galeazzi SRV-300. Characteristics. "MSM-1 USEL" was the first submersible vehicle for underwater research and work  of completely Italian conception. The basic design of "MSM-1 USEL" was done by ESCO of Milan. The pressure hull is made of HY-80 steel and subdivided in two compartments: a cylinder with hemispherical ends located aft, and a sphere forward, interconnected by a cylindrical tunnel. The afterbody is tapered and finishes with the propeller cone. Aft stability planes, two vertical and two horizontal, are arranged forward of the propeller. History. "MSM-1" was updated (MLU - MidLife Update) in 1989 by MARITALIA of Fiumicino. Work took a year to complete and the vessel was renamed "MSM-1S" USEL. The DSRV's maximum depth  was established near Cinqueterre (La Spezia) at . Museum. Since 8 September 2015 "MSM-1S USEL" has been held by the Museo Tecnico Navale (Naval Technical Museum) of La Spezia and now is preserved for the public.