Abstract: A pressure activated time-delayed release device and method. The device includes a body having a drive chamber and a compression chamber disposed therein, a drive piston disposed within the drive chamber of the body, and a compression piston disposed within the compression chamber of the body. A throttle mechanism is disposed between the drive piston and the compression piston. The throttle mechanism controls a release of viscous fluid from the drive chamber into the compression chamber. The drive piston and compression piston are connected so as to cause the compression piston to move substantially simultaneously with the drive piston to compress a compressible element disposed within the compression chamber. The device moves from an un-actuated state to an actuated state when the device is exposed to a predetermined water pressure for a predetermined period of time.