; ▁the ▁self - prop elled ▁se ago ing ▁d red gers ▁Al ▁Jar raf ▁and ▁Ama zone , ▁each ▁with ▁a ▁total ▁installed ▁power ▁of ▁ 1 2 , 8 6 0   k W ; ▁the ▁m ega - tra iler ▁Congo ▁River ▁which ▁has ▁a ▁ho pper ▁capacity ▁of ▁ 3 0 , 0 0 0 ▁t onnes ; ▁and ▁the ▁jack - up ▁Ne pt une . ▁ ▁A ▁further ▁fleet ▁invest ment ▁is ▁scheduled ▁to ▁take ▁place ▁in ▁the ▁late ▁ 2 0 1 0 s , ▁beginning ▁with ▁d red gers ▁Min erva ▁and ▁Sch eld t ▁River , ▁which ▁were ▁delivered ▁in ▁ 2 0 1 7 , ▁followed ▁by ▁Spart ac us , ▁the ▁largest ▁and ▁most ▁powerful ▁cut ter ▁su ction ▁d red ger ▁in ▁the ▁world , ▁in ▁ 2 0 1 9 , ▁and ▁two ▁trailing ▁su ction ▁ho pper ▁d red gers ▁and ▁two ▁split ▁b arg es ▁in ▁ 2 0 2 0 . ▁ ▁In nov ation ▁According ▁to ▁Mort ▁J . ▁Richard son ▁in ▁The ▁Dynam ics ▁of ▁D red ging ▁A ck erm ans ▁& ▁van ▁H aar en ▁held ▁a ▁leading ▁position ▁in ▁techn ological ▁innov ation , ▁from ▁the ▁very ▁beginning . ▁In ▁ 1 8 9 5 ▁A ck erm ans ▁& ▁van ▁H aar en ▁was ▁at ▁the ▁cr ad le ▁of ▁hyd ra ul ic ▁d red ging ▁techniques ▁and ▁successfully ▁designed ▁a ▁su ction ▁d red ger , ▁capable ▁of ▁un