The ship 's dragheads are 6 metres ( 19.7 ft ) wide .
The ship 's dragheads can dredge between 55 metres ( 180 ft ) and 160 metres ( 520 ft ) deep .
The ship 's dragheads are 6 metres ( 19.7 ft ) wide and can dredge between 55 metres ( 180 ft ) and 160 metres ( 520 ft ) deep .