| Bow Thruster removal and underwater repair |
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The first mobdocks for thruster tunnels were initially large, specially shaped, metal structures that fitted to the curved hull around the thruster tunnel.
In many cases, this is now no longer needed (depending on the type of work to be done). Hydrex has broken new ground and pioneered the 'flexible mobdock'. Lightweight, yet manufactured from durable material, it can be easily fitted around both ends of the thruster tunnel. Once the water has been removed, technicians can work within the thruster tunnel. The cost of producing heavy metal structures is usually no longer needed, which in turn means that time can be saved on the repairs. 
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For years cofferdams (called mobdocks in Hydrex terminology - short for 'mobile mini dry docks') had to be large metallic structures that make a watertight fit to the hull of a vessel in order to seal out water from the area that is being repaired. Hydrex has pioneered many different uses of mobdocks including sealing off thruster tunnels at both ends before removing the water and creating a dry space within.
