We are most confident of our dredging technology,which meets the severe conditions of Kanmon Straits: the swiftest currents,rock plates and hard ground. Some hundreds of vessels pass the Kanmon Waterway every day.It requires high dredging technology; we first developed spuds against strong currents, ultra-heavy grabs,excavation method with heavy drop hammers for rock-breaking, echo sonars,high-precison level excavation method in the deep water.These efforts have brought a good reputation and our participation in the large-scale construction works: Honshu-Shikoku Bridges substructure construction works and sunk-tunnel construction works in Bosporus Channel in Turkey,which constitutes Marmaray Project(Railway Bosporus Tube Crossing, Tunnels and Stations). Bosporus Channel(Istanbul City) (trench excavation for sunk tunnel) Rock-Breaking Dredging Works for Hirado Straits waterway (rock-breaking with a 50-ton drop hammer) Smash, removal and loading of concrete structure Removal of a huge stone by a heavy grab Shimonoseki(New Port Area)dredging works Removal of a huge stone by a heavy grab Removed rocks