The Deep Docks door in Hollow Knight: Silksong can be opened by using one Simple Key. Here is how to open it:
- You need the "Swift Step" ability first to safely cross the lava gap in front of the door. This ability allows you to dash in mid-air.
- The locked door is located on a platform just beyond the lava gap in the Deep Docks area.
- Use one Simple Key (a single-use key found in various locations in the game) to unlock the door.
- Once opened, the door reveals a sizable sub-area with new enemies, platforming challenges, and valuable rewards like Flintslate (a tool) and Craftmetal.
- Simple Keys can be purchased or acquired at different places (Bone Bottom, Sinner’s Road, First Shrine, Sands of Karak).
This door and the area it opens are optional and not required for main story progression, so using a key here won’t block game progress. The Deep Docks door is considered a good place to spend a key early for combat power and exploration.
Additionally, there is an ornate clamp door on the old diving bell in Deep Docks that requires the Diving Bell Key from Act 3 to open. This is separate from the simple key door and is for a different part of the area.
Summary:
- Obtain the Swift Step dash ability.
- Get a Simple Key.
- Cross the lava gap using the dash.
- Use the Simple Key on the locked door in Deep Docks to open it.
