Location Function Creator An eco well is a device seen in Jak II. They were used by Baron Praxis at the strip mine to harvest eco, and then release the harvested eco to attract the Metal Heads. Jak destroyed each of these with plasmite bombs during the mission "Blow up strip mine eco wells". Eco wells are large, gray, cylindrical containers, with a little ramp that leads upwards on its front-side. On top of the device there is a vent which will release the harvested eco as would an eco vent.