Smuggler's Hideout

Smuggler's Hideout is a fairly small level, where you'll meet Atlas at last--or at least see him. Head along the path, searching crates as you go and defeating the lone turret that blocks you, until you manage to reach the submersible control room. Flip the glowing switch there, and watch the fireworks. You'll see Atlas run out to the submarine bay, but things go…wrong.

Things take a turn for the bizarre at this point.

Make your way through the nearby corridors, keeping your research camera active in order to photograph the Spider Splicers that will surprise you periodically. Kill the enemies, and blow up all of the fuel canisters you see; some at the bottom of the steps will reveal a semi-secret area. Be sure to look at the lake underneath the steps and telekinesis the anti-armor rounds down there.

When you make it to the submersible, things get even worse. Make your way to the Arcadia bulkhead and head on through.

Arcadia

You'll start finding ingredients in the crates now, which you'll eventually use at the U-Invent stations to create new objects.

After smashing off the chains of the doors, head out into the Tea Garden area. On the southeastern wall here, you'll notice a locked door. There's a torch outside of it that's lit. Use Incinerate on the other torch on the opposite side of the door to unlock it and find plenty of items and inventing materials.

Use Incinerate to open the door here.

Search the Tea Gardens for items. You'll hear voices, but don't think too much about them: these guys aren't friendly. Head through the doors on the north side of the area first; it leads to a little alcove where you can find more items. When you're ready to meet a new enemy, head through the door marked "Rapture Metro". Houdinis await within.

Houdinis are creepy enemies that are capable of disappearing and reappearing elsewhere, as you'll discover. Explore the ground floor of the area here, and try to snap a picture or two of the Houdinis that are creeping around. Keep a weapon out, though, and keep in mind that when a Houdini disappears in front of you, it'll likely wind up reappearing behind you, so watch your back.

When you reach the top of the stairs, kill the Houdinis, then look at the floorboards to find a couple of crawlspaces with goodies.

Through the Glens

Head across the path leading to the Rapture Metro area, using Incinerate to set the oil fields alight, and luring enemies back across them. When you reach the area with the electrically locked door, the turret, and the Circus of Values machine, start, again, looking for crawlspaces. There's one around the corner from the healing machine, near the potted plants, and another one on the wall near the turret. Check the Employee's Only room for more items, but be careful to jump on the table to avoid the electrical traps.

Keep an eye out for crawlspaces in these areas.

Head down the stairs here and through the door to find more Houdinis going to town with some other Splicers; apparently they don't like each other too much. There's a watery passage underneath the area here where you can find another electrical trap; beyond it is a crate and some ammo. You'll also likely spot your first Little Sister here; if you haven't yet, try taking pictures of her for some health and EVE boosts. If you manage to kill the Big Daddy, you can continually shoot the Little Sister (with film) if you rescue her, as she makes her way back to a vent.

There's also your first U-Invent terminal here. Using the junk items that you've been picking up, you can create new ammo for your weapons and other objects, as well. Hack it, then try your best to create some new ammo! Or just keep the junk and wait for a machine with a better selection.

Near the U-Invent, there are some boxes stacked up against the wall. If you can jump atop them and get up to the little ledge above you, you'll be able to open a little box and also crawl up to another crawlspace, where you'll find a shotgun and some items on a corpse.

There are a number of paths leading on from here, including the water path beneath the wooden planks. You want to head north, towards Rolling Hills, but there are also some very large areas to explore that aren't necessarily required, such as the Waterfall Grotto and a storage room down the steps to the west of the Rolling Hills entrance. Look around for items and goodies before moving on to the Rolling Hills. Of particular entrance is a little crawlspace near the Storage Room; after going down the stairs, you'll bypass a healing station and then come out near a Circus of Values area. Search the northeastern corner of the room to find the crawlspace, which contains a safe.

Note the position of the Bot Shutdown panel here. This is one of the first areas of the game where an alarm will summon two security bots instead of one. If you trip the alarm and quickly shutdown the bots, you'll have a pair of helpers guiding you along.