The update added layers of mechanical "grit" to the ship-building process and tactical combat:

Submarines were added as a strategic-only unit. They execute auto-resolved missions against convoys and fleets on the campaign map. To counter them, players must research and equip light escorts with new Anti-Submarine Warfare (ASW) tech like depth charges.

New environmental factors affect accuracy, including engine vibrations at high speeds and shell splash interference , which makes it harder to distinguish range when multiple gun calibers are firing at the same target.

Destroyers and light cruisers can now deploy minefields around ports. These can heavily damage enemy ships attempting port strikes, though specialized minesweeping equipment can clear them. Realistic Design & Combat Refinements

Armor plates now lose resistance as they take damage, meaning even a heavily armored "tank" can eventually be compromised by sustained fire. Community Reception

Newly built ships may suffer from defects like "Overweight" hulls or "Weapon Defects." These add historical character but can be mitigated by investing in construction technologies.