Deep Submerge is Sailor Neptune's defining ocean-powered attack, present in every version of the story and across all of her evolved forms. She hurls a sphere of blue energy shaped like her ruling planet at her enemies.
This sea-based technique belongs to Sailor Neptune throughout the franchise, turning up in the manga, the anime, Sailor Moon Crystal, the musicals, and numerous games. It follows her through each upgraded guardian form she takes, and it eventually grows into a stronger technique named Submarine Reflection.
Neptune raises her arms overhead and sweeps them down, launching a globe of blue energy modeled on the planet Neptune. Water serves as part of the assault, capable of melting foes such as certain Daimon and their sculpted sand creations. On one rare occasion the move even healed a Proto-Daimon in a manner resembling Sailor Moon's own purifying maneuvers, making Neptune the only guardian with a stock attack able to cure a monster. Its blast mimics the crushing pressure of the deep sea and, like Dead Scream and World Shaking, takes the form of the user's planet. She can also fuse it with World Shaking and Dead Scream to unleash a far stronger combined strike.
Sailor Neptune is the exclusive user. In the manga the move debuts in Act 29, guarding Sailor Chibi Moon and Mamoru from a Daimon. The anime introduces it around episode 90, though it goes unnamed until roughly episode 92, when it strikes the Daimon Mikuji. Crystal features it only twice, once countering Mimete and once shattering a boulder in Sailor Moon Eternal. The musicals present it during a Sailor Moon S stage production, and it recurs in several games including Another Story. English dubs have altered its title, calling it Neptune Deep Submerge in the Cloverway version while the Viz release keeps the original name.

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Deep Submerge is Sailor Neptune's signature ocean-powered attack, a sphere of blue energy shaped like her ruling planet that she hurls at her enemies.
Sailor Neptune is the exclusive user of Deep Submerge, wielding it across the manga, anime, Sailor Moon Crystal, the stage musicals, and several video games.
Sailor Neptune raises her arms overhead and sweeps them down, launching a globe of blue energy modeled on the planet Neptune at her target.
On one rare occasion Deep Submerge healed a Proto-Daimon rather than harming it, making Neptune the only guardian whose stock attack can cure a monster.
Yes, Deep Submerge eventually grows into a stronger technique called Submarine Reflection.
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