Above: All emblems from chapter 3
Emblem 1: As soon as the chapter begins, walk forward into the first room and look up and to your left. (This is before you open the door.)
Emblem 2: Soon after you see the water monster for the first time, you’ll emerge from the waist deep water onto a dry path. As you proceed, check your left side for a coffin that can be opened. The emblem is inside.
Emblem 3: If you’re playing as Leon, you’ll reach a section where you have to cover Helena from a distance after the column onto which she jumps collapses. As you’re covering her, look for this emblem. If you’re playing as Helena, just make sure to turn around and check for this emblem before you lower the bridge for Leon.
Emblem 4: As Leon, you’ll reach a point where you must swim to safety as Helena covers you from dry land. Once you climb out of the water, instead of going through the broken metal gate in front of you, turn right and climb the nearby ladder. Backtrack all the way to the corridor pictured above, where you’ll find an emblem in a half-barrel near some assault rifle rounds. As Helena, you’ll run across this naturally as you go to meet up with Leon after the underwater battle.