diff --git a/lib/plant.py b/lib/plant.py
index c1fabfd..2d50031 100644
--- a/lib/plant.py
+++ b/lib/plant.py
@@ -411,7 +411,7 @@ class Anlage():
 
     def get_tunnel_length(self, tname: str):
         if tname in self._tunnels:
-            return self._tunnel_lengths[tname]
+            return float(self._tunnel_lengths[tname])
         raise Exception("Tunnel not found")
 
     def add_tunnels(self, tunnels:dict):
diff --git a/lib/routing.py b/lib/routing.py
index 1a65880..231b930 100644
--- a/lib/routing.py
+++ b/lib/routing.py
@@ -178,6 +178,8 @@ if __name__ == "__main__":
         print(to_json(cable_paths['errors_sensors']))    
         print("failed dists:")    
         print(to_json(cable_paths['errors_dists']))    
+        print("failed tunnels:")    
+        print(to_json(cable_paths['errors_tunnels']))    
 
     # Ausgabe schreiben
     if args.write: