When Cate Archer was preparing to sneak on-board the Lorelei at the Bremen docks, Tom Goodman instructed her to photograph the Captain's Log. Before she had a chance to do so, Magnus Armstrong knocked her out and had her locked in a storage room on the ship. Before Archer could escape, timed Explosives went off preventing Archer from obtaining the Captain's Log. She just had time to place a Beacon on the Radio before having to abandon ship.
Needing to retrieve the Shipping Manifest and the Captain's Log from the sunken vessel, H.A.R.M. sent a Submarine carrying Armstrong, Inge Wagner and several divers to the North Sea. Armstrong's instructions to the divers were to retrieve the manifest and log (as well as a bottle of Laphroaig he had in his quarters}.
Goodman and Archer were on the surface of the North Sea in a Boat also preparing to retrieve the Captain's Log and the Shipping Manifest. Just after Archer had found the Captain's Log, the H.A.R.M. divers found her and she had to fight her way out of the sunken freighter.
Logbook on Wikipedia