A method of operating a mobile platform in a tank at least partially filled with a non-conductive, energetic substance (12, 14), the method characterized by: - configuring the mobile platform to include at least: - an enclosure, - at least one control unit positioned in the enclosure, - at least one propulsion system at least partially positioned in the enclosure, - at least one electrical power supply positioned in the enclosure and configured to supply electrical power to at least one electrical power consumer associated with the mobile platform, wherein the supply of electrical power is capable of adding an electrical charge to the mobile platform, - at least one retrieval system disposed at least partially on the enclosure and including at least one buoyant body, and - at least one charge accumulation control system (250, 1003) disposed at least partially on the enclosure, the at least one charge accumulation control system (250, 1003) being configured to control an accumulation of the electrical charge on the mobile platform by one of: (i) reducing the supplied power and preventing an increase in the supplied power later while the mobile platform is inside the tank, and (ii) disengaging the at least one electrical power consumer from the supplied power and preventing a reengagement of the supplied power with the at least one electrical power consumer later while the mobile platform is inside the tank; - lowering the mobile platform into the tank using a deployment carrier (50, 764, 780); - submerging the enclosure in a non-conductive, liquid energetic substance; - moving the mobile platform using the at least one propulsion system to perform at least one task in the tank; - controlling the electrical charge accumulation on the mobile platform using the at least one charge accumulation control system (250, 1003). - indicating an activation state of the charge accumulation control system (250, 1003) by releasing the at least one buoyant body from the enclosure, the activation state being one of: (i) prior activation of the charge accumulation control system (250, 1003), and (ii) activation of the charge accumulation control system (250, 1003) after a predetermined time delay; and - retrieving the mobile platform from inside to outside of the tank. - configuring the mobile platform to include at least: - an enclosure, - at least one control unit positioned in the enclosure, - at least one propulsion system at least partially positioned in the enclosure, - at least one electrical power supply positioned in the enclosure and configured to supply electrical power to at least one electrical power consumer associated with the mobile platform, wherein the supply of electrical power is capable of adding an electrical charge to the mobile platform, - at least one retrieval system disposed at least partially on the enclosure and including at least one buoyant body, and - at least one charge accumulation control system (250, 1003) disposed at least partially on the enclosure, the at least one charge accumulation control system (250, 1003) being configured to control an accumulation of the electrical charge on the mobile platform by one of: (i) reducing the supplied power and preventing an increase in the supplied power later while the mobile platform is inside the tank, and (ii) disengaging the at least one electrical power consumer from the supplied power and preventing a reengagement of the supplied power with the at least one electrical power consumer later while the mobile platform is inside the tank; - an enclosure, - at least one control unit positioned in the enclosure, - at least one propulsion system at least partially positioned in the enclosure, - at least one electrical power supply positioned in the enclosure and configured to supply electrical power to at least one electrical power consumer associated with the mobile platform, wherein the supply of electrical power is capable of adding an electrical charge to the mobile platform, - at least one retrieval system disposed at least partially on the enclosure and including at least one buoyant body, and - at least one charge accumulation control system (250, 1003) disposed at least partially on the enclosure, the at least one charge accumulation control system (250, 1003) being configured to control an accumulation of the electrical charge on the mobile platform by one of: (i) reducing the supplied power and preventing an increase in the supplied power later while the mobile platform is inside the tank, and (ii) disengaging the at least one electrical power consumer from the supplied power and preventing a reengagement of the supplied power with the at least one electrical power consumer later while the mobile platform is inside the tank; - lowering the mobile platform into the tank using a deployment carrier (50, 764, 780); - submerging the enclosure in a non-conductive, liquid energetic substance; - moving the mobile platform using the at least one propulsion system to perform at least one task in the tank; - controlling the electrical charge accumulation on the mobile platform using the at least one charge accumulation control system (250, 1003). - indicating an activation state of the charge accumulation control system (250, 1003) by releasing the at least one buoyant body from the enclosure, the activation state being one of: (i) prior activation of the charge accumulation control system (250, 1003), and (ii) activation of the charge accumulation control system (250, 1003) after a predetermined time delay; and - retrieving the mobile platform from inside to outside of the tank.