(Based on the US TV Show & Novel by William Brinkley: "The Last Ship")

The idea is that the world has suffered from a catastrophic viral infection. It spreads via the air by being near or in contact with someone who is infected. It is high contagious, nearly 99% lethal, and only a very select few are immune to it (due to gene mutations at birth that somehow left a very few lottery winners). Players will play their nation, in reality a vessel at sea. Be it a luxury yacht, a naval vessel, a cruise ship, a tanker, or a submarine even. Since we are out at sea, we can assume that none of us have gotten sick. Our goal is to survive, finding supplies at sea or on land (where the danger of infection is high), as well as making contact with other survivors. Rebuild the world, or eliminate the competition through "war", it is your choice. 

Any takes on an idea similar to this? There will be limiting factors and pros/cons to each class as follows: 

1. Naval Surface Warfare vessel, light (i.e. Destroyer, Frigate, Cruiser)

2. Naval Surface Warfare vessel, heavy (i.e. Aircraft Carrier, Freighter, Amphibious Transport Dock (LPD))

3. Cruise Ship

4. Commercial Freighter/Tanker/Research Vessel

5. Fishing Vessel

6. Yacht (Luxury, Super)

7. Sail 

8. Naval Sub-surface Warfare Vessel, light (Attack submarine)

9. Naval Sub-surface Warfare Vessel, heavy (Ballistic Missile Submarine) 

Around four to six players.