Before you send the hard disk to a hardware data recovery specialist, always try first to decrypt and perform a data recovery using the DETech recovery tools. 

See the DETech user guide for instructions.

Hard disk data recovery tools
DETech Standalone is a disaster recovery tool that allows an administrator to perform normal recovery functions. These tools perform functions under a Windows-like environment and include features such as booting from BartPE and easier access to USB drives.

The following documentation is intended to help corporate security administrators understand these recovery tools. The articles include procedures to recover data from systems that are unrecoverable.