The Angler Sub or drone is a fast moving deep water light recon submersible that can lure any number of WILD squid to its location.  The submersible  is designed to outspeed the giant squid it attracts, and is resistant to the squids grab, but still vulnerable to its melee attacks. The angler sub has a secondary attack that can deploy to release the grasp of giant squid parasites on all other (friendly and unfriendly) vessels within radius simultaneously. The angler drone may attract any number of wild squid in this way, and must be used strategically and cautiously if it is to be used successfully.

The idea here is to have an invisible debris unit be ejected in a randomized direction from the sub when it detects an enemy unit. The debris when destroyed will spawn the giant squid (hopefully at a randomized location near our sub). After this, the sub is intended to flee the scene, while the WILD squid begins to threatens the opponent.

The unit is unable to acquire veterancy.

The Leviathan is a large deep sea submersible equipped with powerful magnetic coils that are able to lift and pull units from land into their water graves. The Leviathan will surface while attacking land units revealing its position, but when attacking units at sea it will prefer to stay submerged where instead of lifting the unit and attracting it, it moves to a lower depth and activates its coils from beneath the enemy ship, sinking it from below..

In basic terms our magnetron sub is using the standard siege version of its weapon on ships. Instead of pulling them closer for no reason, he'll just damage them from a slightly closer range. One issue here is that the warhead will need to deny all land structures, but not the naval yard since  when using this weapon submerged we are not decloaking on fire, which would look very weird if it was attacking a land structure without surfacing in this way. This effectively makes this unit less of a tier 3 dreadnaut counterpart, and more of a floating tank destroyer.

The Soviet Ice Breaker is a heavily armoured ship equipped with a well armed crew that provide supportive fire from the deck of its iron hull. Unlike other vessels, the Ice Breaker can cross thick icepack that is normally inaccessible to all other naval units. In combat the Ice Breaker does not have to rotate when firing, and can fire when moving, and is most effective vs land infantry, light ships, surfaced dolphins and squid.

Immediate issues: Okay its possible to make a terrain for this purpose, Its possible but quite abit of work surrounding it (realistically if you havent expanded your maps there are only half dozen snow maps in the base game that require modification). Now the Ice Breaker may never break ice physically leaving water in its wake, like in real life, but having the ability to traverse a designated terrain type that other naval units cannot is still a tactical advantage. Additionally he doesnt have to rotate to fire, and can fire when moving, but it cannot detect submerged units. But maybe perhaps can fire upon them when detected, with vastly lower accuracy and damage output.