Submarine is a TSS → TSD → PC opener developed by Eternalaws and Not Kaiyon, given the name "Submarine" due to its shape roughly resembling a Submarine submerging into water. This opener can be performed with an early L/J in the first bag. This opener leaves a relatively clean and easy to downstack board state thanks to multiple donation methods in the second bag.
Variant 1
This is the main route to submarine with easy to spot perfect clear patterns.
Requires relatively early LJ or LZ.
PC Chance - 93.33%
If you have a late I and/or receive garbage when going for PC you can opt for a TSS into Tetris.
Variant 2
This variant rarely ends up with an extra O after perfect clear.
Requires relatively early OL or OZ.
PC Chance - 94.52%
Note: Not all pc patterns are visualized, full list of pc patterns Link -> [1]
Variant 3
While not often buildable, this variant almost guarantees a perfect clear everytime with easy to spot patterns.
J→Z→L
PC Chance - 99.25%
Note: Not all pc patterns are visualized, full list of pc patterns Link -> [2]
Variant 4
This variant mainly consists of LJI on the left but sometimes you can get the same field from doing a donation Tspin double and then insert the I piece on left when you get a late I.
PC Chance - 95.4%
There are possible Tspin single or double solutions
Note: Not all pc patterns are visualized, full list of pc patterns Link -> [3]
S Prop Variant
O→L
TSD Followup
J→S
The third bag TSD variant is only dependent on a J before S thanks to multiple helpful L spins.
There is one possible perfect clear pattern for this follow up at only 7.14% chance but it is easy to spot.
3rd bag PC Chance - 40%
Non PC Variant
This pattern has a very high succession rate thanks to multiple alt formations.
Possible Followups
J→S/Z, L→O
L→S→Z, O→J
You can put a Z piece on the right to freestyle a TSD with basic stacking on the left.
Mirroring submarine
It is advisable to shift I for submarine while mirroring rather than using the usual form for lower KPP (Keypresses Per Piece) on the first bag. Variant 1,2 and 3 are available for shifted I while other variants cannot be done. Shifted I has an exclusive variation too.
Usual submarine mirrored
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Shifted I mirrored
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Residue
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Variant exclusive to shifted I
The S piece in the first pattern can be tucked in after L and J are placed while the J piece in the second pattern can be spun in after S piece is placed.
PC Chance - 96.47%
There are 5minimal solutions: