The present invention relates to an improved robot assembly for bomb disposal, especially for disposing an improvised explosive device (IED). The robot assembly comprises a platform coupled to an electric motor drive unit and steerable in a direction corresponding to a user input. The robot assembly is characterized by an omnidirectional drive locomotion system having a set of Mecanum wheels rotatably attached to a body of the platform for providing omnidirectional maneuverability to the platform; a swing arm for supporting the set of Mecanum wheels; a spring damper for selectively operating to compensate for uneven terrain; a reduction gear system for facilitating rotation of the set of Mecanum wheels; an explosive countermeasure unit comprising a manipulator arm , wherein the manipulator arm comprises a clamp and a water disruptor; and a data processing unit comprising a microcontroller for receiving the user input and executing an instruction associated with the same.