// constructor
public Submarine(Engine eng, NavigationPanel panel)
{
crew = new List <Human>();
foodSupply = new FoodSupply();
oxygenSupply = new OxygenSupply(100000.0); // maximum oxygen capacity set to 100k
genericWaste = new Waste("Generic");
engine = eng; // engine and navigation panel will be prepared somewhere else
navPanel = panel;
equipment = new List <ITool>()
{
navPanel
};
}