I took my S110V Manix LW swimming in the Atlantic with no blade corrosion whatsoever over several days, S110V likely has the best corrosion resistance of what is available in the PM2.
The hardware might be an issue, though. Idk what materials they use for the rest of the PM2.
I do still tend to agree with Sumdumguy that the Caribbean is a far better choice for ocean work.
Own: Delica, yOld S30V Native, pointy Breeden Rescue, Delica, HAP40 Endura, ZDP DF2, S110V Manix LW,Pakka Delica, Cru-wear Para 3, SE H1 DF2, M4 Manix, HAP40 Caly 3, S90V Native 5, K390 Urban, Pakka DF2, Cruwear PM2, SE Pac Salt, HAP40 Jazzlica, S110V Native, P.I.T.S., DLC Manix, REX 45 PM2, Para 3, XHP Manix LW, SB Caly 3, 20CV PM2, Rhino, SB Calypso Jr., B70P, PMA11, K03, ZDP Stretch 2, Kapara, REX 45 Military, 154CM Manix LW, 204p PM2, Swick, SG Delica, BL Lil'Native, AEB-L Urban, HAP40 Stretch, KC Cruwear Manix,Cruwear Military, M390 PM2, Cruwear Delica, 4V Lil'Native, Mantra 2, CruCarta Shaman, M390 Para 3 LW, M390 Manix, K390 Police 4, RexWood Shaman, DLC Cruwear Shaman, Rex 45 Manix, Native 5, Native LW, 204p Para 3, S45VN PM2, S90V Manix LW, 20CV Manix, Rex 45 Lil’Native, Shaman, C208GP Cruwear Manix
Waiting for: SPY27, K490, Swick 5, and something purple.