Lowestoft,ships that passed in the night.

One day you look out the window and see a virtually empty dock and the next it can be full.Sometimes the boats arrive during the nigh,normally you don't hear them above the shouts of the drunks piling out of the pubs and night clubs so it's sometimes a suprise to see the dock busy first thing in the morning.A lot of these boats have 'Survey' written on the side.
I wonder what they do.