* SugarWiki/AwesomeMusic: [[https://www.youtube.com/watch?v=qHKVs6PT02E The Channel.]]
** [[https://www.youtube.com/watch?v=5V4U2G1sX7Q The Playstation version's Final Boss music.]]
* BreatherLevel: In the arcade version, the rather easy Seabed Ruins was preceded by ThatOneLevel. Following it was the rather tough final stage.
* DemonicSpiders:
** Bomber enemies drop a stream of bombs almost constantly. If the bombs are damaged, they just turn into flaming bombs that can still destroy your submarine.
** The Antarctic Ocean Stage as well as the final stage has the golden sea mines. These explode into a burst of eight indestructible bombs when destroyed. They also can start a chain reaction with other sea mines, causing a lot of smaller bombs to be fired off...
** The Deep Dark Sea stage has grey, futuristic deep-sea submarines. That fire off indestructible aimed shots. And start coming in a column of SIX. And they come at you indefinitely unless you progress further to the right... The only good thing is that they can't take much damage. Starts at 2:25 [[https://www.youtube.com/watch?v=MJI-z9hO4eo&feature=related here]].
** The Sunken Town stage has a seemingly endless amount of [[GiantMook large submarine enemies]] that fire homing missiles and can [[MookMaker deploy smaller drones]]. Thankfully, they can be easily destroyed by attacking the drone hatch.
* FridgeLogic: The boss of the [[LethalLavaLand Deep Dark Sea]] spews deadly fire in a flamethrower fashion. ''Underwater''.
* GoddamnedBats:
** Almost all the stages have annoying little yellow robots that drop bombs on you if they are above the water, and launch homing missiles if they are underwater. They also come in great numbers, and sometimes they will just drop on you from nowhere.
** Annoying patrol boat enemies that spawn endlessly will try to drop depth charges on you in some areas.
** There are also endlessly spawning helicopters that do the same too.
* NightmareFuel: The seabed ruins boss, a [[PuzzleBoss giant living statue]], turns out to be organic once you deplete its health. Its central face explodes, revealing a [[{{Squick}} bloody, flesh-like interior]] with [[EyeScream eyes dangling out of their sockets]]...
* PlayerPunch:
** If you complete a solo run with no continues, [[spoiler:you are [[EarnYourBadEnding "rewarded"]] with a BittersweetEnding where although D.A.S. is destroyed, so is you and the vessel you were in.]]
** At the end of a two-player run, [[spoiler:[[FightingYourFriend both players are forced to fight each other until either side runs out of lives]]. If you think refusing to fight your partner will let both of you live, guess again, as ''both of you'' [[RocksFallEveryoneDies sink to the bottom of the sea]].]]
* PortingDisaster: The Saturn port is plagued with slowdown in between gameplay.
* SpiritualAdaptation: Playing a 2-player game to the end [[spoiler:turns the game into ''VideoGame/StreetsOfRage'' [-WITH SUBMARINES!-] Like in one ending of ''[=SoR=]'', both players duel each other and whoever wins becomes the new leader of the resident evil organization. At least in this game, you don't have to then take on the BigBad.]]
* ThatOneAttack: [[FinalBoss Yugusukyuure]] uses an attack where it generates a minefield of INDESTRUCTIBLE small red mines in [[SequentialBoss two of its phases]]. Said attack resembles a BulletHell, and this attack is the only one that those two phases will use.
* ThatOneBoss: Two of them.
** The first is J3, a three-headed, fire-breathing [[MixAndMatchCritters cross between a dragon and a whelk]]. While its attacks are not too hard to avoid, there are lava vents around the room that periodically spew out fast-moving fireballs that can easily kill you if you're not careful.
** The FinalBoss can be counted as one too. In two of its phases, it fires out [[BulletHell a LOT of indestructible, annoying red mines that float to the left of the screen]], [[ThatOneAttack where you will need to worm your way through]]. In its final phase, it has two attacks that are relatively moderate to avoid, but the main problem is that it has A TON of health.
* ThatOneLevel:
** The Deep Dark Sea stage. At one point you have to manoeuvre through lava vents that spew out lava balls that travel in annoying arcs. At another point, you are pitted up against endless waves of [[DemonicSpiders high-tech submarines that fire INDESTRUCTIBLE aimed plasma shots]]. The first few waves only consist of two or so, but later on you have to fight against SIX of them in a column from the top to the bottom of the screen! Not to mention that the [[OurDragonsAreDifferent three-headed dragon-whelk J3]] was ThatOneBoss too. Prepare to die A LOT on this level...
** The final stage, due to the first section being chock-full of [[DemonicSpiders golden sea mines]], and the area right before the FinalBoss is the DeathCourse mentioned at the top of these tropes.