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The opening anti-submarine attack (OASW) can be performed by any ship with displayed ASW value of 100 or greater (ship's ASW stat + equipment ASW, not counting equipment [[improvements]]) and at least one {{Sonar}}.
The opening anti-submarine attack (OASW) can be performed by any ship with displayed ASW value of 100 or greater (ship's ASW stat + ''any'' equipment ASW stats, not counting equipment [[improvements]]) and at least one [[sonar]].
*{{ShipLink|Isuzu/Kai Ni}} and {{ShipLink|Asashio/Kai Ni D}} are exempted from the above requirement and can always perform the opening anti-submarine attack, even with less than 100 displayed ASW or without any ASW equipment.
*{{ShipLink|Isuzu Kai Ni}} is an exception and can always perform OASW, even with less than 100 displayed ASW or without any ASW equipment.
*{{ShipLink|Taiyou}} can perform OASW with [[Type 97 Torpedo Bomber (931 Air Group)]] or [[Tenzan (931 Air Group)]] (and no other aircraft) with displayed ASW at 65 or higher. {{ShipLink|Taiyou/Kai}} and {{ShipLink|Taiyou/Kai Ni}} can with any aircraft if the previously mentioned ASW requirement at 65 is fulfilled.
*{{ShipLink|Taiyou}} can perform OASW with [[Type 97 Torpedo Bomber (931 Air Group)]] or [[Tenzan (931 Air Group)]] and displayed ASW of 65 or greater (the usual condition is also applicable). For {{ShipLink|Taiyou/Kai}} and {{ShipLink|Taiyou/Kai Ni}} the bombers are not required, 65 displayed ASW is sufficient (hovewer, if she is not using a torpedo or dive bomber with ASW stat, she will be able to perform OASW attack but will be unable to perform ASW attacks in the shelling phase).
*[http://kancolle.wikia.com/wiki/Category:Coastal_Defense_Ships Coastal Defense Ships] can perform OASW at the lower displayed ASW requirement at 60.
*[[:Category:Coastal Defense Ships|Coastal Defense Ships]] can perform OASW with displayed ASW of 60 or greater. With displayed ASW of 75 or greater and equipment ASW of 4 or greater they can perform OASW without a sonar equipped.
*If several ships fulfill the requirements, then they all can perform preemptive attacks, each attacking a random submarine in the enemy fleet. The firing order is determined by the range order, similar to the First Shelling Phase. The order for ships of the same range is random.
*If several ships fulfill the requirements, then they all can perform preemptive attacks, each attacking a random submarine in the enemy fleet. The firing order is determined by the range order, similar to the First Shelling Phase. The order for ships of the same range is random.
*The damage follows the [[Damage_Calculation|usual ASW formula]] and is affected by the usual modifiers (formation, engagement, health, ammo), as well as equipment [[improvements]].
*The damage follows the [[Damage Calculation|usual ASW formula]] and is affected by the usual modifiers (formation, engagement, health, ammo), as well as equipment [[improvements]].
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The following tables show how much base ASW is needed (in form of required ship level) to enable OASW with a given equipment setup (T4: [[Type 4 Passive Sonar]], T3: [[Type 3 Active Sonar]], DC: [[Type 3 Depth Charge Projector]]).
The following tables show how much base ASW is needed (in form of required ship level) to enable OASW with a given equipment setup (T4: [[Type 4 Passive Sonar]], T3: [[Type 3 Active Sonar]], DC: [[Type 3 Depth Charge Projector]]).