MESMA is cool:-
Quote- '' To lessen the submarine's vulnerability, the vessel can be equipped with an air independent propulsion system such as:
the Stirling engine, the fuel cell, the closed circuit diesel and the odule d'Energie Sous-Marine Autonome (MESMA) system .
The MESMA anaerobic system, in which heat in the primary circuit is produced by burning ethanol with oxygen,
can be easily installed either at the start of the submarine's construction or in a later modernisation
to convert the CM-2000 to an AM-2000 build standard. With the MESMA system the AM-2000 submarine
can stay down in underwater patrol three times longer than the CM-2000. Its performance features remain
the same in all other respects, except that the length increases to 0m and its submerged displacement
to 1.870t (against the 61.7m and the 1,565t of the CM2000). ''
The Black Shark (great name) has superior two-way communication.
Quote:- ''The Black Shark is also equipped with an advanced sensor capability, allowing the target classification
function even in very complex and unfavorable underwater scenarios. ''