Ensdorf-class minesweeper

Type 352 Ensdorf-class minesweepers are a class of five minesweepers of the German Navy. They are Type 343 Hameln-class minesweepers that have been upgraded with the Troika Plus system of minesweeping drones

Design
The Ensdorf class have three modes to clear mine fields:


 * Troika Plus: This system employs up to four remote controlled Seehund ("seal") drones which perform the sweep. The drones are small unmanned boats that can simulate the acoustic and magnetic signatures of bigger ships to trigger mines. Their small size and special construction let them survive the effects of exploding mines unharmed.
 * Mine hunting: Mines detected with the hull-mounted sonar can be identified and exploded with expendable Seefuchs (Seafox) ROVs.
 * Classical minesweeping: Against moored mines the classical minesweeping using towed wire cutters to cut the anchors of mines can be conducted.

The Ensdorf class replaced the Type 351 Lindau-class minesweepers in service with the German Navy.

Seehund


The Seehund unmanned surface vehicles can be controlled remotely or manually by an onboard crew (usually three) for maneuvering in harbours or in training (the Seehund is too large to be carried by Ensdorf-class vessels). A life raft is carried for this reason. Seehunds are 25 m long with a displacement of 99 t. They are propelled by a Schottel Z-drive which gives them a maximum speed of 9 - 10 kn.

ROVs
The Seehunde ROVs were taken from the six decommissioned Type 351 class, which means that they are older than their motherships.