This game is a distant relative of Mille Bornes.You play Convoy cards hidden and try to take them across (accumulate 4000 nautical miles). When an Alert is played, the convoy is vulnerable to attack by warships (carrier beats destroyer beats frigate and so on down to the sub, but two subs beat the carrier) if you cannot defend against the attack, your convoy is sunk (score is based on the convoy's tonnage). Otherwise it survives and the alert is passed. You can play an End of Alert, of course. Two Airplane cards in a row (by the same player) will also sink the convoy the Airplane Hit card defends. The Mine sinks the convoy outright unless a Minesweeper is played. The Storm slows you down but you cannot be attacked except by the Mine. You can fly the Neutral pavilion, which protects you against anything but the Mine.Radar cards can reveal the convoy's value. This may be good, revealing the decoy Fishing Trawler (of no value), or bad --the revealed convoy is worth double, either to the sinker or the player!The game is played in several hands until a set score is reached. - BoardGameGeek