Deepest.

This is coolbert:

“The deep-sea unit of which we today lay the keel will be unique in its class - only units of this class are capable of diving to significant depths for studies, development and execution of specific operations in the marine environment of the World Ocean,” - Vladimir Grishechkin.

Primary mission of this deep-diving mini-sub the probably destruction of undersea fiber-optic Internet cables.

"Russia’s Defense Ministry says its new mini-sub will be able to dive to 11,000 meters depth"

That depth of 11,000 meters about 36,000 feet almost all the way to the depth of the Challenger Deep deepest point in the ocean.

 "It will be operated by GUGI, the notorious deep sea espionage and sabotage unit of the Russian military."

From Independent Barents Observer | ByAtle Staalesen | April 19, 2024.

A group of dignitaries from the Russian Defence Ministry and shipbuilding industry on 27th of March assembled at the Admiralty Yard in St.Petersburg to lay the keel of a new special-purpose submarine.

"The vessel will be only few meters long and have a hull of titanium . . . will, according to sources associated with the Russian Defense Ministry, be able to dive to 11,000 meter depths."

Apparently NOT a totally 100 % ROV for underwater exploration. ROV= remotely operated vehicle. 

Can be manned on a task basis?

coolbert.