diff --git a/aoc25.cabal b/aoc25.cabal
index 2f071f2..9114f1e 100644
--- a/aoc25.cabal
+++ b/aoc25.cabal
@@ -67,7 +67,7 @@ executable aoc25
     -- other-extensions:
 
     -- Other library packages from which modules are imported.
-    build-depends:    base ^>=4.18.2.1,
+    build-depends:    base ^>=4.20.2,
                       containers >= 0.6.7
 
     -- Directories containing source files.
@@ -82,3 +82,12 @@ executable day7
     build-depends:    base ^>=4.20.2,
                       containers >= 0.6.7
     hs-source-dirs:   app
+    default-language: GHC2021
+
+executable day8
+    import:           warnings
+    main-is:          Day8.hs
+    build-depends:    base ^>=4.20.2,
+                      containers >= 0.6.7
+    hs-source-dirs:   app
+    default-language: GHC2021
diff --git a/app/Day8.hi b/app/Day8.hi
new file mode 100644
index 0000000..67c2bf7
Binary files /dev/null and b/app/Day8.hi differ
diff --git a/app/Day8.hs b/app/Day8.hs
new file mode 100644
index 0000000..81c51e1
--- /dev/null
+++ b/app/Day8.hs
@@ -0,0 +1,91 @@
+module Main where
+
+import Data.Char (readLitChar, showLitChar)
+import Data.Function (on)
+import Data.Ix (inRange)
+import Data.List (foldl', nub, sort, sortBy)
+import Data.Map (Map)
+import qualified Data.Map as M
+import Data.Set (Set)
+import qualified Data.Set as S
+import Debug.Trace
+import System.Environment (getArgs)
+
+main :: IO ()
+main = do
+  input <- readFile . head =<< getArgs
+  putStrLn $ unwords ["Part 1:", show $ part1 1000 input]
+  putStrLn $ unwords ["Part 2:", show $ part2 input]
+
+newtype Pos = Pos {unPos :: (Int, Int, Int)}
+  deriving (Eq, Ord)
+
+instance Show Pos where
+  showsPrec _ (Pos (x, y, z)) = showParen True $ shows x . showLitChar ',' . shows y . showLitChar ',' . shows z
+
+instance Read Pos where
+  readsPrec _ s = do
+    (x, ',' : rest) <- reads s
+    (y, ',' : rest') <- reads rest
+    (z, rest'') <- reads rest'
+    pure (Pos (x, y, z), rest'')
+
+dist :: Pos -> Pos -> Double
+dist (Pos (x1, y1, z1)) (Pos (x2, y2, z2)) = sum . map ((^ 2) . fromIntegral) $ [x2 - x1, y2 - y1, z2 - z1]
+
+-- | Original idea: Combine all positions to a cartesian product and
+-- calculate the distances between them. Pick the n shortest distances
+-- and connect them.
+--
+-- Problem: The problem space explodes and grinds to a halt.
+part1 :: Int -> String -> Int
+part1 n = go [] 0 . nub . sortBy (compare `on` fst) . traceShowId . (\ps -> combine ps ps) . map (read @Pos) . lines
+  where
+    combine :: [Pos] -> [Pos] -> [(Double, (Pos, Pos))]
+    combine [] _ = []
+    combine (a : as) bs = trace ("combine: " ++ show (length as) ++ " positions left...") $ map (\a' -> (dist a a', (a, a'))) as ++ combine as bs
+
+    go :: [(Set Pos, Int)] -> Int -> [(Double, (Pos, Pos))] -> Int
+    go circuits _ [] = product . take 3 . sortBy invCompare $ map (S.size . fst) circuits
+    go circuits connections ((d, (a, b)) : rest)
+      | connections <= n = trace ("part1: " ++ show (n - connections) ++ " junctions left...") $ go (connect circuits a b (round d)) (connections + 1) rest
+      | otherwise = product . take 3 . sortBy invCompare $ map (S.size . fst) circuits
+
+    connect :: [(Set Pos, Int)] -> Pos -> Pos -> Int -> [(Set Pos, Int)]
+    connect [] a b d = [(S.fromList [a, b], d)]
+    connect ((c, l) : circuits) a b d
+      | S.member a c && S.member b c = (c, l) : circuits
+      | S.member a c = (S.insert b c, l + d) : circuits
+      | S.member b c = (S.insert a c, l + d) : circuits
+      | otherwise = (c, l) : connect circuits a b d
+
+    invCompare :: (Ord a) => a -> a -> Ordering
+    invCompare a b = b `compare` a
+
+part2 :: String -> Int
+part2 = error "Not implemented"
+
+testInput :: String
+testInput =
+  unlines
+    [ "162,817,812",
+      "57,618,57",
+      "906,360,560",
+      "592,479,940",
+      "352,342,300",
+      "466,668,158",
+      "542,29,236",
+      "431,825,988",
+      "739,650,466",
+      "52,470,668",
+      "216,146,977",
+      "819,987,18",
+      "117,168,530",
+      "805,96,715",
+      "346,949,466",
+      "970,615,88",
+      "941,993,340",
+      "862,61,35",
+      "984,92,344",
+      "425,690,689"
+    ]
diff --git a/app/Day8.o b/app/Day8.o
new file mode 100644
index 0000000..e5cdd19
Binary files /dev/null and b/app/Day8.o differ
diff --git a/input/day8.txt b/input/day8.txt
new file mode 100644
index 0000000..2e587cf
--- /dev/null
+++ b/input/day8.txt
@@ -0,0 +1,1000 @@
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