Captain Grant Sims plays a crucial role in the game Atomfall, as he enlists your help to recover a stolen radio component from the druids. Though his mission is part of the main storyline, players have the option to complete the game without direct interaction with him, thanks to the title’s six unique endings. Each ending revolves around your escape from the quarantine zone, requiring engagement with various characters to unlock different escape routes.
As one of the six potential allies that can aid your escape, Grant Sims initially tasks you with reclaiming the stolen radio part. This mission sets the stage for him to subsequently outline a possible escape plan—details will be kept under wraps to prevent spoilers.
This article serves as a comprehensive guide on locating Captain Grant Sims’s stolen radio part and provides step-by-step instructions on how to retrieve it while navigating functionality in Atomfall.
Locating Captain Grant Sims’s Stolen Radio Part in Atomfall
Finding Captain Grant Sims
Your journey begins by locating Captain Grant Sims. Make your way to Wyndham Village, which you access after completing the Slatten Dale area. This village provides an early opportunity to interact with the captain.
Position yourself at the Village Green, specifically at map coordinates 33.9 E, 80.3 N, where Sims is delivering a speech. Wait for him to finish speaking, then approach him directly. He will invite you to accompany him to City Hall, which is conveniently situated nearby. You can decide to follow him now or return at a later time.

When engaging with Sims, it’s advisable to adopt a friendly and supportive demeanor instead of an aggressive one. He will express concern regarding unusual activities within the village and point you toward a lead. The most effective strategy is to visit St. Katherine’s Church located near Village Hall, where a consequential murder takes place.
Rather than attempting to solve the murder mystery, return to Sims with the information you’ve gathered. He will then direct you to consult Dr. Garrow, a vital character in the game who can assist in your escape endeavor.
Gathering Information from Dr. Garrow (Early Interaction)
If you’ve made initial contact with Sims and are at the game’s beginning, proceed to Skethermoor Prison to gather information from Dr. Garrow. She will introduce a device known as the Signal Redirector, which is essential for progressing further in the game. Make sure to procure this item.
Upon returning to Captain Sims with your findings, he will then assign you the task of retrieving the stolen radio part from the druids, promising to reveal an escape strategy afterwards.
If you’ve already liberated Dr. Garrow prior to talking to Captain Sims, he will caution you about her potential danger, and even suggest eliminating her if you cross paths again. Following this warning, he will again task you with recovering the stolen radio part.

Journey to Casterfell Woods
Navigate to Casterfell Woods by using the entrance located on the northwestern fringe of Wyndham Village at map coordinates 29.6 E, 83.6 N.
Entering The Speaking Cave
Upon entering Casterfell Woods, head towards the west until you reach The Speaking Cave at map coordinates 23.0 E, 85.4 N, where you will notice a door at the base of a hill.
Retrieving the Stolen Radio Part
As you explore the cave, remain vigilant as druids will attack you on sight, with most engaging in melee combat and some utilizing bows. Make sure to eliminate the threats as you move forward.

The cave’s layout presents two paths converging at the same point. Eventually, you will encounter a large statue made of tree branches, adorned with hanging skulls. Adjacent to this statue, an elevated passage will lead you to a door marked as an offering area.
Within this offering space, look underneath to locate the Protocol Radio Part, which is the item you need to secure. Once obtained, make your way back to Captain Sims.
This concludes the guide on how to find Captain Sims’s stolen radio part in Atomfall.