Changes
→E-4 - Central Pacific Sea - Sweep Against Subs in the Frontline
[[File:6-4.jpg|thumb|320px|E-4 Map]]
[[File:6-4.jpg|thumb|320px|E-4 Map]]
*Rewards [[New High-pressure, High-temperature Steam Boiler]], [[Repair Goddess]] , [[Ship Repair Facility]] and one Medal upon clear
*Rewards [[New High-pressure, High-temperature Steam Boiler]], [[Repair Goddess]] , [[Ship Repair Facility]] and one Medal upon clear
*Boss is [[Submarine So-Class|Submarine So-Class Elite]]
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