Wedge or pyramid wading can be useful for transporting a large number of people across swift moving water. The top of the pyramid faces upstream and uses a paddle for support. Everyone else forms up behind them making a large triangle. The downstream side of the triangle becomes a sizable triangle. Take care to face the point of the triangle directly into the current and expose the sides of the triangle as little as possible. Here is a video demonstrating this technique: Wedge Wading Technique.