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[Jman4117]

Actually, if you get just above the ground level, any HTH aliens can still kill you. And if you think that flying makes you invincible to alien grenades/blaster bombs, you are totally wrong.

All of the explosions in the game are 3-D, which is handy for bases (throw HE onto access lift and run!)

Wrong... I routinely use a few flying suits for this purpose. I nearly 10 years of playing this game I have YET to be attacked hand to hand on a different level. Also I enter the bridges on large ships a lot using a blaster bomb with a guy hovering directly over the impact point. The only damage it ever does is to the floor tile on the next level.