The "Exploring Pendola Pass" quest in Arc Raiders is intended to be one of the first you tackle in the 'Frozen Trail' update, as it essentially acts as a whistlestop tour of some of the map's most notable points of interest. Given to you by Celeste, you need to visit three specific locations, and destroy a whopping 20 Arc enemies while you're at it. It doesn't need to be completed in one round though, so you can chip away at this while you complete other quests, such as "Clean Hands" and "Sizing Things Up," if you like.
Here's a full guide on how to complete "Exploring Pendola Pass" in Arc Raiders, including where to find the control room in Cielo Sereno Observatory and the tallest tower in the Railyard. Here are all four quest steps for "Exploring Pendola Pass" in Arc Raiders, which can be completed in any order: Destroying 20 Arc enemies is simple, if a little time-consuming, so we won't include a dedicated section for that one. I'd recommend using a long-range weapon, such as an Anvil or Renegade, to take out Wasps, Hornets, and Fireflies from afar, and steer clear of the new Bully enemy because it will absolutely ruin your day.
Make sure you have a wire on you when you visit the Railyard, and we recommend bringing a mobility gadget such as a grappling hook, snaphook, or zipline for both that task and the one at the observatory. Luckily, you receive three ziplines for accepting the quest, so make sure to bring them along. The Cielo Sereno Observatory is located in the northeast corner of Pendola Pass.
The quickest way to get to the control room (the location of which is shown in the image above) is to use a zipline, grappling hook, or snaphook to get on the roof. Otherwise, you can take the stairs underneath the building. Find any hole to drop through, and you'll be near the control room, which is south-facing and on the western side of the building.
Interact with the prompt which says "inspect the tech" to complete the objective, but don't try and do this if you're mid-combat, because it will electrocute you for a few seconds upon completion. As mentioned above, you need to bring a wire for this task. When you've got one, go to the southeastern side of the location, where you'll see a tall tower.
On the map, it's directly east of the "Railyard" location name, and south of the Controlled Receiving Facility. This is where you'll need a zipline, grappling hook, or snaphook to get to the very top. When you're up there, interact with the prompt to patch into the antenna, which will consume your wire.
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