The ship 's dragheads are wide and can dredge between and deep . The ship has three hopper discharge options of pumping ashore by pipeline , dumping through bottom doors or rainbowing . The ship has equipment to dredge almost any material ; such as clay , silt , sand and rock . During the Swissair Flight 111 salvage operation , a mixture of sea water , silt and aircraft pieces was pumped out of the Atlantic Ocean . The ship assisted in the recovery of nearly 98 % of the aircraft , with over of aircraft and cargo pieces salvaged . The pump room onboard has two dredge engines that can be used in series or in parallel with the vessels two suction pipes or combined with a submerged outboard pump . The vessel also has three jet water pumps that are used to agitate subsea material whilst trailing , collapse and liquify hopper cargo for pumping or degassing natural air pockets in the seabed using the Venturi effect
Swissair Flight 111
Swissair Flight 111
Queen of the Netherlands (ship)