Right they bought 2 8" Keenes. Just 1 of the dredges I posted will move as much as 275 yards/hr.The material is in slurry form.Not mostly waterlike he suction dredges made by Keene.To put tings in perspective , 8" Keene moves about 40 yds/hr. So a piranha is 7x more efficient than an 8" suction dredge.