Rescuing all survivors in Roblox's 100 Days at Sea increases the Day Count Multiplier. There are different Survivors you must rescue from different Islands. These Survivors will join your base and help process resources. In this article, we go over how to rescue all Survivors in 100 Days at Sea.
All 6 Survivors in 100 Days at Sea
Only three Survivors will spawn during a run in 100 Days at Sea. Each Survivor spawns on an Island of their own. You must locate these Islands using the Radio. Here are all the details of all Survivors and how to rescue them:
1. Captain Stephen - Cliff Island

Captain Stephen spawns inside a shelter on top of the Cliff Island. Use your Harpoon to reach him, then remove the items blocking the entrance to his shelter. You can either drag the items away or place them in a Sack.
Once the entrance is clear, you can rescue Captain Stephen. This is one of the easiest Survivors to rescue in 100 Days at Sea. You don't need to fight any enemies or complete any puzzles.
2. Doctor Madeline - Cage Island

Doctor Madeline is trapped inside a cage on the Cage Island. To rescue her, find the small purple-and-gold Chest on the Island and collect the Key inside it. Drag the Key to Doctor Madeline's cage to unlock it.
Three Boku Pokus are defending the area. You can easily defeat them without requiring any high-level weapons.
3. Professor Erik - Ghost Pirate Island

Professor Erik is trapped inside a cage guarded by eight Ghost Pirates on the Ghost Pirate Island. The Ghost Pirates spawn one at a time. The Ghost Pirates are relatively dangerous, so I recommend bringing a Gun before attempting this rescue. Once you defeat all Ghost Pirates, Professor Erik will leave the cage.
4. Test Subject Terrence - Lab Island

Test Subject Terrence is trapped inside a containment tube on the Lab Island. Pipes are running throughout the Island. You must press the red buttons near the pipes to free Terrence. These buttons are easy to find; look for clusters of pipes.
5. Miss Felix - Lava Island

You find Miss Felix in a trap above a lava pool on the Lava Island. There is a stream of water running through the Island. You must rotate the pathway pieces and position them correctly to direct the water onto the lava. Once you complete the puzzle, the lava extinguishes. After which, Miss Felix leaves her cage.
6. Deck Chief Dan - Mining Island
Deck Chief Dan is trapped inside an abandoned mine on the Mining Island. You must blast your way through the mine to reach him and complete his rescue. The Island is full of Dynamites, which you must carry to the blastable walls.
Once you bring Dynamite to a wall, it will automatically light and explode, destroying the wall. There are four walls you must blast through to reach Deck Chief Dan.
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What Survivors Do in 100 Days at Sea

After rescuing a Survivor, they teleport to your base and automatically start helping with various tasks. They activate machines, place items into the Crafting Table, and add fuel to the Bonfire until it reaches its maximum level. Each Survivor grants a permanent +1 Day Count Multiplier. The enemies do not attack the Survivors during Night Raids.
That is all for Survivors in 100 Days at Sea. Make sure to check out the 100 Days at Sea Wiki for more guides.
FAQs
Rescuing Survivors grants a permanent +1 Day Multiplier for each Survivor saved. They also help around the base to process resources.
You can rescue up to three Survivors during a single survival run.
You can locate trapped Survivors on nearby islands by using the Radio structure.