Hmmm 1/3 seems your only option. You may be sighted if you enter Manila Harbor from the coast and that's no good. You're taking a chance surfacing. If I were you run 2/3 on the surface and submerge at 1/3 about a mile away from Manila Harbor entrance until you reach your destination and out of the mouth of the harbor.
Peabody you sure grow up fast you Stinky Mate, you.
