The start of the investigation with happened at that time which was out of the ordinary. the dredge stuck out like a sore thumb. dredging is something which is necessary to maintain channels going in and out of ports. basically, if you ve got a port and you don t dredge the sea, every tide will bring some sand and sediment back in the channel, and eventually it will block up so nobody would be able to get in and out. so near daily dredging occurs where dredges will go along and gather up the sand and then will take it back out to spoil sites. what you have in a river like the tees is 120 years of toxic industry. so everything was dumped in there. ....