This event requires to use "submarine fleets" on the last phases of E-2 and E-3 using the [[File:{{ROOTPAGENAME}} Tag 5.png|30px]] tag, and on the 2nd to last phase of E-4 using the [[File:{{ROOTPAGENAME}} Tag 10.png|30px]] tag.
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In all cases, it is possible to clear those phases on "free to play", using regular fleets and mechanics. However, if possible, it is advised to utilize the "'''[[Submarine Touch]]'''" to at least clear each last dance is still recommended to save on cost and greatly optimize the clear rate.
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*Using this touch imply to consume {{Card|Submarine Supply Material|type=Item|size=30x30px}} '''{{Item/Link|Submarine Supply Material}}''', a premium item.
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To optimize the "pay to win" aspect of this mechanic, it is then advised to:
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*Only buy Submarine Supply Material once in the [[Shop]], giving 3 of those for 500 DMM points,
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*Only use this touch on the "last dance" of the boss of those specific phases,
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*Always refresh ("F5") the game '''BEFORE the boss battle ends''' if the touch failed to kill the boss, to not consume any material on failed runs.
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This way, a total of only '''3''' Submarine Supply Material is needed to clear the event.