Submarine Sea, is the 1st underwater hidden stage of SR that requires 100% wins to be unlocked (but not the only) if you don't have a good DPS thunder, fire or physical weapon, this stage is a piece of cake, if not, it won't be so easy
But this stage should really be tried, since it decreases your AGI by 30% if won, this means 100/0.7 ~ +43% DPS!
Trivia[]
This is the first underwater hidde stage that require 100% wins there is, but it's not the only!
This enemy shoots 6 fast moving spear that pierces characters and the ground. The spears can deal damage quickly, so they should be killed as soon as possible.
These enemies are easily defeated because of their many weaknesses, but should not be taken too lightly, as they have quite the range and the spears can cause a lot of damage.
Possibly even worse than the Red Big Mask Fish, with more LP and a more dangerous spawn. It does have a very large weakness to Thunder, similar to the aforementioned Fish.
This boss is pretty tough and deals a lot of damage if players let it reach their characters. That is at the same time it's weak spot: its range is fairly low, and it has a high weakness to both Fire and Thunder, all in all making it a lot less difficult than one would expect. Fighting this boss is also rewarding because it can drop 3 different level 8 compo items.
Compo item stats:
Red Crystal 8: AT + (8-48)
Bronze Medal 8: +100% drop rate
Ruby 8: Add 12-18 fire damage
Garnet 8: +2.5s fire Length
Fire Spirit 8: 5% enemy dies Blazes (Summon 80 blazes in a way like fire god 7 ring does, but with a damage of 333-666, and each lasts for 5s)