[Arknights CN] DH-S-4 CM, First Clear

More Ch'alter showcase.
Stickers used:
- +4 starting cost
- +3 anti-erosion machine
- Melee operators have +40% ATK while submerged
- Ranged operators have +200 DEF (mistake, supposed to take +200 ATK instead)
- Melee operators have no ASPD penalty while submerged