Our Terra Spike Machine uses a compressed air injection system.
It releases a blast of compressed air, at extremely high pressure, at the exact compacted depth. The compacted soil is shattered allowing free passage of air to the roots. Any water that is perched will be free to drain away.
It will also help relieve high worm activity in the soil.
Worm castings are left by worms on the surface of the soil in wet conditions. These castings form a hard sealant that stops rainwater from draining through the soil surface.