You may have noticed that after installing the 3.03 patch, the Aftermath Soviet mission "Situation Critical" gets nearly unplayable as all the subs you have at the beginning suddenly uncloak, exposing themselves to enemy Tesla coils. As I recently found out, this happens because in v3.03, a feature was built to uncloak all submarines if a player has no other units remaining, for the sake of multiplayer games. However, the devs somehow forgot this screws up a singleplayer mission (I hope only this one).

Anyhow, the solution turned out to be really simple: I placed a player-owned Destroyer just outside the visible map area, so it can't be used, but its presence nixes out the auto-uncloak trigger for the subs. This change also does not affect win/lose triggers as the mission is lost only if all Missile Subs or Volkov and/or the scientist are destroyed.