Natural Selection/Map-specific Strategies

ns_nancy... may you rest in peace. Best NS map ever.

Move out of Rine start
The Rine start is hard to defend for the Marines, because of it's many entrances and cramped space. Atmospheric is a great choice. Other inventive ones are the Tram Tunnel, right in the middle, and hard for a Skulk to rusk in. The Refinery Hive is also a better choice, where it is open.

If attacking Refinery, get Jetpacks
Refinery has to be the worst hive in NS for aliens. Wide, wide open. Jetpacks will tear aliens up like none other, so get them.

Know thy vents
Bast has a cool vent system that can get you from 1 place to another pretty quick. You'll be at a big advantage if you can exploit them.

Hold your breath!
Theres an underwater tunnel underneath the Feedwater Hive that leads to Refinery. It's a fast way to get there. The catch? Marines won't survive it, they'll drown. Other aliens will run low on oxygen, so they'll have to wait a second for their health to restore.

Bile from the vent
Marines dumb enough to stay in Marine start? Goood. Dumb enough to weld the vent closed? Excellent. You see, even with that vent closed, theres a small slit you can Bile Bomb their base through. So go Gorge and run up that vent. Drop an OC and DC/MC at the top of the ramp - sometimes Marines like to sneak up the vent to kill you, the OC chamber will take care of that. And, Bile Bomb away! LMGs and HMGs are innaccurate enough that few bullets will pass through the slit. GLs will mess you up fast though, so run like a sissy if they start lobbing nades.

Funniest. Strategy. Ever.
Those dumb marines... still in Marine start? Humiliate them. You'll probably need 100 res for this, so its an endgame thing. But its much more devastating than an Onos! You know that elevator near Marine start? Build a SC, if possible, near the bottom. This is mostly for you to hide if in trouble. The Marines probably have an Observatory, so you'll need to back up a bit to cloak. Anyway, take almost all your res and build OCs on the elevator. Make sure its down first :-p. You can cram 8-10 on there. Build a few DCs down at the bottom too. Now, all set up? Press the elevator button. They all rise up and spike the rine spawn to death =D. OCs getting hurt? Press the button and bring them back down for healing!

Relocation - risky, but it could work
The Marine start isn't too bad. It is mostly open. But there are some inventive spots to relocate too. One being behind Processing, in the halls near those weldable grates. You can build your base there a while before being noticed. None of the hives, except for Generator, are really open, but Generator has no nearby res nodes.

Weld Vents
The vents in this map provide extremely fast access to different hives. WELD- THEM-SHUT. Especially the one in Shipping and Lower Sewer. Cut them off ASAP.

Sniper
Have MCs? Be a Lerk. Get on top of the pipe thats near the main drag from Marine Spawn leading to sewer. Get Silence. You can snipe with Spikes from that pipe a long time before being noticed. Just be sure not to spore - it will give away your position. You may want to drop chambers up there to help you out. You can also put offense chambers up there for an unpleasant surprise.

Get that double node!
Processing is right in the middle of the map, and is a double res node. It would be nice if you could get that. If the other team has it locked down though, leave it be. Its not worth sacrificing yourself and giving the enemies res.

For the love of god. WELD HORSESHOE!
As SOON as the map starts, get an Armory and drop a welder. Get the vent at Horseshoe welded ASAP. Lerks can get in that in spore you to death fast, and your pretty much sunk until you get GLs or JPs - not for a while.

Resource Tower is under attack!
The res nodes in this map are pretty hard to defend. Use this to your advantage. If your a Marine, Electrify them at first. Also, get a rambo whos a skilled player to go resource tower hunting. This will put you at a huge advantage. As an alien, get the 2nd Hive ASAP so you can Bile Bomb those electrified resource towers.

Jetpacks, not HA
All 3 Hives in this map are fairly open, especially Computer Core. Jetpack/ Shotties are your main weapon of choice here, not HA.

Early Turret Killing
There are a lot of opportunities in this map to outrange turrets, or creep out of vents to only be visible to 1. A patient Lerk can spike Turrets to death, leaving a blind spot that leaves the TF open to attack.

Marine Spawn=evil
Like bast, get the hell out of there. It's not a good place to be. Holoroom would be an ideal place to relocate to, since its open and has double res. You want this place. Bad. Group up and try to relocate to Holo. It's quite hard for the Marines to win without it.

Hide in the shadows
The tunnel at the bottom of the elevator near Marine spawn is an awesome place to hide and bite passing Marines, with or without cloaking. It's very, very dark down there, so use that to your advantage.

OMG J00 NUB!
You can do some evil stuff outside of Marine spawn, where their res tower is.