A birthday gift for
That was a month ago. I just haven't posted anything here for a long time...

This is the same mini-universe as the pictures about corporate cities.
Since most of the world is destroyed by wars and anarchy and warlords flourish there, the main trade routes lie through the seas. But 90% of the shipping lanes are controlled by the Royalland Assistance Commonwealth since more than half of their inhabitants are marine life. This empire controls the maritime trade routes and destroys any competitors both at sea and in the coastal zone.
These are their saboteurs from the Marine Corps. Breathing equipment is needed only for speech and communication between combat swimmers. That is, they can act without masks, but then coordination over long distances will not be available.
Only combat divers from GSDR can compete with them, but they are usually otters and compensate for the difference in biology due to more sophisticated equipment with underwater maneuvering devices. Although there is a shaky neutrality between Royalland and GSDR. The Northerners do not violate the borders of the Commonwealth and are the main supplier of machines in this world.