I don't think that there will be a Jetpack in GTA4 and so do flying cars! They wan't to make the game what more realistic then it can be and those two ideas aren't realistic!
The facts:
1. It is 14 times closer to its star then Earth
2. They measured temperature only one day/weak/ month, it could be like a desert, night-very cold, day-very hot
3. Water missing
But when you escape you will find more danger. Rockets! They will come from two sources. two missile launchers so destroy them before you enter the underground.
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