Improvements in and relating to underwater excavation apparatus

摘要

An underwater excavation apparatus 105 having a housing 120 with at least one inlet 125 and at least one outlet 130, the at least one inlet provided on or at a side 126 of the housing. A fluid flow path F extends from the at least one inlet 125 to the outlet 130. The fluid flow path has a first portion F1 provided at or adjacent the at least one inlet 125. The first portion F1 is substantially perpendicular to a longitudinal axis A of the housing 120 and substantially straight. A second portion F2 extends or continues from the first portion. A third portion F3 extends or continues from the second portion F2. The third portion F3 is substantially straight, contains at least part of a rotor 110 and is divergent away from the longitudinal axis A of the housing 120 in a flow direction from the inlet 125 to the outlet 130.