Physical model of buoyancy and its implementation for application in the simulated scuba diving

We describe the physical model of buoyancy and its numerical implementation for the purpose of developing the core element of the training simulator for basic diving skill - buoyancy control. In the model, we take into account the physical laws of diving, based on Newton's and Boyle's law. The change of the air volume in the diver's lungs due to breathing is considered; but we neglect the change in the thickness of the diver's suit, effects of active swimming and the change of water temperature. Flexible user interface has been developed with Matlab to allow testing, tuning and validation of the model.