Today’s two-way drill is the Phalanx 360/180 drill. In this sequence, only one formation is used, the Phalanx. First one skydiver will take the formation grip offset to the right, then after a 360 degree turn by both divers, offset to the left. After both fliers take a 180 degree turn, the drill is reported for the other flier.
These diagrams show the drill being performed in a tunnel. Note how each Phalanx has both fliers lined up with a line going down the center of the tunnel. This helps the fliers maintain relative body position, and it also informs the turn direction: always turn towards the center line in this drill.
Find a printable PDF of this dive flow here.
As always, remember to get professional instruction before performing any skydiving or tunnel flying activities.