diff --git a/2018/day17-input b/2018/day17-input
new file mode 100644
index 0000000..1e2ccdd
--- /dev/null
+++ b/2018/day17-input
@@ -0,0 +1,1713 @@
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+x=556, y=124..131
+y=496, x=472..476
+y=718, x=467..489
+x=652, y=1363..1375
+x=627, y=1884..1910
+y=794, x=464..491
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+x=550, y=999..1012
+x=578, y=598..608
+x=446, y=481..503
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+y=937, x=473..496
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+y=1568, x=576..585
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+x=515, y=878..881
+x=442, y=203..223
+x=435, y=1914..1922
+y=1420, x=658..664
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+x=607, y=625..633
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+x=524, y=900..902
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+y=373, x=570..572
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+x=453, y=1897..1912
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+x=450, y=550..560
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+x=583, y=906..910
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+x=557, y=322..345
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+x=585, y=906..910
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+x=510, y=301..315
+x=535, y=40..67
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+x=644, y=948..970
+x=459, y=548..557
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+y=1665, x=515..537
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+y=247, x=658..662
+x=483, y=728..739
+y=861, x=514..531
+y=1801, x=469..471
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+y=713, x=499..511
+y=301, x=570..583
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+x=573, y=961..972
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+x=515, y=1904..1926
+x=656, y=1197..1200
+x=456, y=103..113
+x=617, y=1583..1590
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+x=570, y=274..301
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+y=1758, x=536..640
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+y=929, x=527..547
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+x=651, y=1217..1243
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+x=656, y=1021..1029
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+x=619, y=1324..1326
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+x=514, y=770..779
+x=616, y=1324..1326
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+y=1103, x=591..601
+y=1710, x=659..663
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+x=488, y=234..246
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+x=523, y=6..25
+x=630, y=1231..1233
+x=444, y=1339..1350
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+x=438, y=1412..1430
+x=546, y=1272..1295
+y=1530, x=545..568
+x=590, y=266..282
+y=868, x=656..662
+x=603, y=1320..1331
+x=457, y=1241..1254
+x=498, y=1662..1672
+x=573, y=856..868
+x=634, y=494..521
+x=552, y=979..991
+x=532, y=573..576
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+y=182, x=616..639
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+x=520, y=1765..1778
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+x=615, y=1507..1533
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+x=462, y=685..698
+x=640, y=1075..1093
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+x=568, y=556..559
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+x=619, y=1550..1552
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+x=573, y=708..712
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+x=625, y=1319..1331
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+x=571, y=1456..1464
+x=448, y=1667..1673
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+y=1207, x=586..602
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+y=689, x=531..552
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+x=570, y=861..864
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+x=608, y=920..938
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+x=525, y=450..461
+y=1232, x=542..546
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+x=480, y=1689..1695
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+x=548, y=1437..1455
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+x=431, y=1330..1348
+y=1053, x=552..567
+x=594, y=1693..1695
+x=479, y=787..789
+x=567, y=1654..1659
+y=902, x=524..528
+y=98, x=577..580
+x=554, y=253..263
+x=609, y=1856..1860
+y=203, x=488..503
+x=527, y=918..929
+x=607, y=901..915
+x=511, y=1905..1926
+y=436, x=498..503
+x=446, y=1224..1236
+x=580, y=131..142
+x=663, y=1708..1710
+x=512, y=1138..1145
+x=529, y=508..518
+y=298, x=605..613
+y=1867, x=524..542
diff --git a/2018/day17.py b/2018/day17.py
new file mode 100644
index 0000000..6cb9c31
--- /dev/null
+++ b/2018/day17.py
@@ -0,0 +1,88 @@
+with open('day17-input', 'r') as file:
+  data = [l.strip('\n') for l in file]
+import numpy as np
+import re
+
+# numbers = [[int(s) for s in re.findall(r'-?\d+', d)] for d in data]
+Xmin = [int(re.findall(r'x=(\d+)', d)[0]) for d in data]
+Xmax = [int(re.findall(r'x=(?:\d+\.\.)?(\d+)', d)[0]) for d in data]
+Ymin = [int(re.findall(r'y=(\d+)', d)[0]) for d in data]
+Ymax = [int(re.findall(r'y=(?:\d+\.\.)?(\d+)', d)[0]) for d in data]
+
+# arr = np.array(numbers, dtype=np.int64)
+#
+# # x, y_start, y_end
+#
+y_min = min(Ymin)
+y_max = max(Ymax)
+
+x_max = 700
+
+init_grid = np.zeros((x_max, y_max), dtype=np.int64)  # 0 = Sand, 1 = Clay, 2 = water
+spring = [500, 0]
+
+for xmin, xmax, ymin, ymax in zip(Xmin, Xmax, Ymin, Ymax):
+  init_grid[xmin:xmax+1, ymin:ymax+1] = 1
+
+grid = init_grid.copy()
+
+def drop_water(source=spring):
+  x, y = source
+  print('Dropping water from', source)
+  surface = grid[x, y:].argmax()
+  if surface == 0:
+    return False
+    # raise ValueError('Out of bounds')
+  surface_y = surface + y - 1
+  # Find walls left and right
+  wall_left = (grid[x:0:-1, surface_y] > 0).argmax()
+  wall_right = (grid[x:, surface_y] > 0).argmax()
+  if wall_left:
+    left_x = x - wall_left + 1
+    cliff = (grid[x:left_x-1:-1, surface_y + 1] == 0).argmax()
+    if cliff:
+      print('Found left wall but cliff present')
+      wall_left = False
+  if wall_right:
+    right_x = x + wall_right #- 1
+    cliff = (grid[x:right_x, surface_y+1] == 0).argmax()
+    if cliff:
+      print('Found right wall but cliff present')
+      wall_right = False
+
+  if wall_right and wall_left:
+    # Fill level of basin
+    grid[left_x:right_x, surface_y] = 2
+    return True
+  sub_returns = False
+  if not wall_left:
+    cliff = (grid[x:0:-1, surface_y+1] == 0).argmax()
+    if cliff:
+      # Drop off the left
+      sub_returns |= drop_water((x - cliff, surface_y))
+  if not wall_right:
+    cliff = (grid[x:, surface_y+1] == 0).argmax()
+    if cliff:
+      # Drop off the right
+      sub_returns |= drop_water((x + cliff, surface_y))
+
+  return sub_returns
+
+
+
+def visualize():
+  vis_rows = []
+  for row in range(y_max):
+    vis_rows.append(''.join([('.', '#', '~')[grid[col, row]] for col in range(x_max)]))
+
+  with open('day17-vis', 'w') as file:
+    file.write('\n'.join(vis_rows))
+
+# arr is all clay shelves
+
+# drop_water((502, 35))
+
+
+# 14572 low
+# 15414 low
+# 23233 low ??????