View source for World 6/6-1

{{World/Hub}}
==World 6-1: 中部海域哨戒線 Central Sea Combat Patrol Line==
{{LabSortieworld
| page = World 6/6-1
| difficulty = ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆
| item = -
| exp = 380
| code = 潜水艦作戦 (Submarine Operation)
| jptext = 有力な潜水艦隊を編成し、中部海域哨戒線に進出せよ。敵艦隊を発見、これを漸減撃滅せよ！
| entext = Organize a strong submarine fleet and advance a patrol line into the Middle Sea region.  Locate enemy fleets and gradually destroy them!
| aircon = {{AirControlSystem
| Map = 6-1 CV Fleet
| Fleet = 1CV, 1CL, 1CLT, 3SS(V)
| Route = {{MapRoute|C|red|F|red|G|blue|H|red|K|red}}
| AS = 126
| Notes = Has a 15% chance to off-route to Node {{MapRoute|I|red}}
}}
{{AirControlSystem
| Map = 6-1 AS Fleet
| Fleet = 1AS, 1CL, 4SS(V)
| Route = {{MapRoute|A|blue|F|red|G|blue|H|red|K|red}}
| AS = 126
| Notes = 
}}
}}

===Map Unlocking & Progression===
'''6-1''' is unlocked after clearing [[5-4]] HP bar.

To clear the map, the boss's flagship must be sunk once.

===Stage Guide===
{{MapBranchingTable
|title = 6-1 Branching Rules
|id = 6-1

|0 -> A/empty, B/empty, C=
*Meet '''ANY''' of the following to '''FORCE''' B
**CA(V)+(F)BB(V)+CV(L/B) ≥ 3
**(F)BB(V) ≥ 2
*Meet '''ANY''' of the following to go to A
**Fleet contains SS(V) only
**Fleet contains AS '''and''' meets '''one''' of the following
***SS(V) ≥ 3, no other ship types allowed
***SS(V) = 3 and DD = 2
***SS(V) = 4 and CL+DD = 1
*Go to B if fleet contains no CL and DDs
*Otherwise, C

|A/empty -> D = * Fleet does not contains AS

|A/empty -> F = * AS Is in the fleet

|G/empty -> H = 
* Meet '''ALL''' of the following requirements:
** Amount of SS(V) ≥ 3
** Amount of BB(V) + CV(L/B) + CA(V) ≤ 1
** Pass the LoS check: ≥ 16 (Cn4)
***Routing becomes random if 12 ≤ LoS ≤ 15.9 (Cn4)

|G/empty -> I =
* Meet '''ANY''' of the following requirements:
** Fail the LoS check
** Amount of SS(V) ≤ 2
** Amount of BB(V) + CV(L) + CA(V) ≥ 2
* If the fleet does not contain AS:
** 15% chance of off-routing to I regardless of LoS check result

|H -> E/empty, J, K = 
* Always node E if LoS ≤ 20 (Cn4)
* If the fleet contains AS:
** Always node K if LoS ≥ 25 (Cn4)
** Random between E and K if 20 ≤ LoS ≤ 24.9 (Cn4)
* If the fleet does not contain AS:
** Always node K if LoS ≥ 36 (Cn4)
** Random between J and K if 25 ≤ LoS ≤ 35.9 (Cn4)
** Random between E, J and K if 20 ≤ LoS ≤ 24.9 (Cn4)
}}

===Tips===
*At least 3 SS(V) are required to reach the boss.
*There are LoS checks at {{MapRoute|G|blue|H|red}} and {{MapRoute|H|red|K|red}}. They do not have high LoS requirements, but an all-submarine fleet without recons/radar can be sent to {{MapRoute|I|red}}.

===Recommended Fleets===
<tabber>
|-|CV fleet=
*'''1CV, 1CL, 1CLT, 3SS(V)'''
*Route = {{MapRoute|C|red|F|red|G|blue|H|red|K|red}}
**Has a 15% chance to off-route to Node {{MapRoute|I|red}}
***The CLT can be replaced with an AS to avoid this.
**Most effective fleet for taking out the boss but it will have to go through node {{MapRoute|C|red}} where there's a Ru-class Flagship.
*Using a {{EquipmentLink|Type A Kouhyouteki|Type C Kouhyouteki|Type D Kouhyouteki Kai (Kouryuu Kai)|text=Midget Submarine|link_category=Midget Submarine}} on both the CL & CLT gives a powerful [[Opening Torpedo Salvo]] (Otorp).
*For the CV, either:
**The CV may use several {{Equipment/Link|Kikka Kai|Jet Keiun Kai|text=Jets|link_category=Jets}}, adding the [[Jets|Jet Assault]] phase to the already strong Otorp, allowing to wipe all pre-boss fleets before they can attack the fleet.
**The CV should be equipped with a {{range}} [[:Template:Range Extension|range extender]] to be set on ''Long Range'', and so act first after the Opening phases (note that [[Jets]] also extend the range to long).
*Try to use a CVB so that it can attack even in ''Chuuha''.

|-|SS fleet=
*6SS(V)
*Route = {{MapRoute|A|blue|D|red|F|red|G|blue|H|red|K|red}}
**Allows the fleet to completely ignore any enemy ships that can't attack SSs, however node {{MapRoute|D|red}} is pretty harsh on SS with late-model DDs and flagship CLs.
**Count on the [[Opening Torpedo Salvo]] (Otorp) & [[:Category:Late Model Submarine Torpedoes|cut-in attacks]] (at boss), so only remodeled SS are recommended when using this composition. 
**Recon seaplanes or {{EquipmentLink|Submarine Radar & Waterproof Telescope|Submarine Radar & Passive Radiolocator (E27)|Late Model Submarine Radar & Passive Radiolocator|text=Submarine Radars|link_category=Submarine Radar}} may be used to meet the LoS requirements. 
***If opened, the Submarine Radars can be fitted in an [[Reinforcement Expansion]].
**As SSVs have few slots, only one may just carry all the seaplanes. As many combat-capable submarines as possible are needed for this route.


|-|AS fleet=
*1AS, 1CL, 4SS(V)
*1AS, 2DD, 3SS(V)
*Route = {{MapRoute|A|blue|F|red|G|blue|H|red|K|red}}
**The shortest route in terms of the number of battles.
**'''1AS combined with at least 2 SS(V) unlock the "[[:Template:Submarine Touch|Submarine Touch]]", a special attack that can trigger several times on the map, consuming a [[Submarine Supply Material]] per battle.'''
**The AS can equip recon seaplanes to free up slots for the SS(V)s.
**A trade-off is that any enemy ship still in light damage or better shape at the end of the shelling phase will have fewer targets to launch their torpedoes at, so the AS and its escorts have to tank all the preboss ships that can't perform ASW.

|-|Node I=
Node {{MapRoute|I|red}} has some good drops like [[I-401]] .
*To farm here, it is possible to use:
**1BB, 3CLT, 1CL, 1CV
**1CL, 3CLT, 2CV 
**Route = {{MapRoute|C|red|F|red|G|blue|I|red}}
</tabber>

{{Map/Footer|6-1|

|enemycompsnotes=

|shipdropnotes= 

}}