extern void object::ServiceTower2()
{
	object	tower;				 // info. about tower
	object	station;			 // info. about station
	
	// 1) find the defense tower
	tower = radar(DefenseTower); // look for tower
	
	while ( true )				 // repeat forever
	{
		// 2) go to the power station to recharge
		station = radar(PowerStation);
		goto(station.position);  // go there
		while ( energyCell.energyLevel < 1 )
		{
			wait(1);			 // wait until recharged
		}
		
		// 3) go back to defense tower
		goto(tower.position);	 // go to tower
		
		message( "Tower Service ready" );
		// 4) wait until power cell is empty
		//	   keep enough energy to go to the station
		while ( tower.energyCell.energyLevel > 0.4 )
		{
			wait(1);
		}
		message( "Tower Service begin" );
		
		// 5) switch the power cells
		grab(InFront);			 // grab the power cell
		drop(Behind);
		grab(EnergyCell);		  // switch the cells
		drop(InFront);
		grab(Behind);
		drop(EnergyCell);		  // used cell to go to the station
		
		// continue to 2)
	}
}