Biomimetic turtle device

A biomimetic turtle device comprising:

• a trunk unit including a trunk which has at least one water reservoir therein, a head which is connected with a front portion of said trunk, a dorsal shell which is connected with a top portion of said trunk, and at least one weight adjusting mechanism which is disposed within said trunk and operable to actuate water storage or discharging of water from said water reservoir to vary weight of said trunk unit;
• a limb unit including a pair of front limb mechanisms and a pair of rear limb mechanisms;
• and
• a control unit including a water depth sensor which detects water depth where said biomimetic turtle device is and sends a signal, and a circuit module which is electronically connected with said weight adjusting mechanism, said limb unit and said water depth sensor, said circuit module receiving the signal from said water depth sensor and determining if said biomimetic turtle device is at a target water depth position, wherein said weight adjusting mechanism is operated to vary the weight of said trunk unit if said biomimetic turtle device is not at the target water depth position so as to adjust density of said trunk unit to thereby adjust a water depth position of said biomimetic turtle device.