diff --git a/nullptr/central_command.py b/nullptr/central_command.py
index 013906c..29c92ba 100644
--- a/nullptr/central_command.py
+++ b/nullptr/central_command.py
@@ -1,6 +1,6 @@
 from nullptr.store import Store
 from nullptr.models.ship import Ship
-from nullptr.mission import *
+from nullptr.missions import create_mission
 from random import choice
 from time import sleep
 from threading import Thread
diff --git a/nullptr/command_line.py b/nullptr/command_line.py
index cc85563..923fa5d 100644
--- a/nullptr/command_line.py
+++ b/nullptr/command_line.py
@@ -90,5 +90,8 @@ class CommandLine:
       except EOFError:
         self.handle_eof()
         break
-      self.handle_cmd(c)
+      try:
+        self.handle_cmd(c)
+      except Exception as e:
+        logging.error(e, exc_info=True)
       
diff --git a/nullptr/missions/__init__.py b/nullptr/missions/__init__.py
new file mode 100644
index 0000000..c095596
--- /dev/null
+++ b/nullptr/missions/__init__.py
@@ -0,0 +1,18 @@
+from nullptr.missions.survey import SurveyMission
+from nullptr.missions.mine import MiningMission
+from nullptr.missions.haul import HaulMission
+from nullptr.missions.travel import TravelMission
+
+
+def create_mission(mtype, ship, store, api):
+  types = {
+    'survey': SurveyMission,
+    'mine': MiningMission,
+    'haul': HaulMission,
+    'travel': TravelMission
+  }
+  if mtype not in types:
+    logging.warning(f'invalid mission type {mtype}')
+    return
+  m = types[mtype](ship, store, api)
+  return m
diff --git a/nullptr/mission.py b/nullptr/missions/base.py
similarity index 65%
rename from nullptr/mission.py
rename to nullptr/missions/base.py
index 5e0732a..6515f54 100644
--- a/nullptr/mission.py
+++ b/nullptr/missions/base.py
@@ -239,138 +239,3 @@ class BaseMission(Mission):
       f'dock-{nm}': (self.step_dock, f'refuel-{nm}'),
       f'refuel-{nm}': (self.step_refuel, next_step)
     }
-    
-class MiningMission(BaseMission): 
-  @classmethod
-  def params(cls):
-    return {
-      'site': MissionParam(Waypoint, True),
-      'resource': MissionParam(str, True),
-      'dest': MissionParam(Waypoint, True),
-      'delivery': MissionParam(str, True, 'deliver'),
-      'contract': MissionParam(Contract, False)
-    }
-  
-  def start_state(self):
-    return 'travel-to'
-    
-  def steps(self):
-    return {
-      **self.travel_steps('to', 'site', 'extract'),
-      'extract': (self.step_extract, {
-        'done': 'dock',
-        'more': 'extract'
-      }),
-      'dock': (self.step_dock, 'sell'),
-      'sell': (self.step_sell, {
-        'more': 'sell',
-        'done': 'orbit',
-      }),
-      'orbit': (self.step_orbit, 'jettison'),
-      'jettison': (self.step_dispose, {
-        'more': 'jettison',
-        'done': 'extract',
-        'full': 'travel-back'
-      }),
-      **self.travel_steps('back', 'dest', 'unload'),
-      'unload': (self.step_unload, {
-        'done': 'travel-to',
-        'more': 'unload'
-      }),
-    }
-  
-  def get_survey(self):
-    resource = self.st('resource')
-    site = self.rst(Waypoint,'site')
-    # todo optimize
-    for s in self.store.all(Survey):
-      if resource in s.deposits and site.symbol == s.waypoint():
-        return s
-    return None
-    
-  def step_extract(self):
-    survey = self.get_survey()
-    print('using survey:', str(survey)) 
-    result = self.api.extract(self.ship, survey)
-    symbol = sg(result,'extraction.yield.symbol')
-    units  = sg(result,'extraction.yield.units')
-    print('extracted:', units, symbol)
-    self.next_step = self.ship.cooldown
-    if self.ship.cargo_units < self.ship.cargo_capacity:
-      return 'more'
-    else:
-      return 'done'
-  
-  def step_dispose(self):
-    contract = self.rst(Contract, 'contract')
-    typs = self.ship.nondeliverable_cargo(contract)
-    if len(typs) > 0:
-      self.api.jettison(self.ship, typs[0])
-    if len(typs) > 1:
-      return 'more'
-    elif self.ship.cargo_units > self.ship.cargo_capacity - 3:
-      return 'full'
-    else:
-      return 'done'
-  
-class SurveyMission(BaseMission):
-  def start_state(self):
-    return 'survey'
-  
-  def steps(self):
-    return {
-      'survey': (self.step_survey, 'survey')
-    }
-  
-  def step_survey(self):
-    result = self.api.survey(self.ship)
-    #pprint(result, 2)
-    self.next_step = self.ship.cooldown
-
-class HaulMission(BaseMission):
-  def start_state(self):
-    return 'travel-to'
-  
-  @classmethod
-  def params(cls):
-    return {
-      'site': MissionParam(Waypoint, True),
-      'resource': MissionParam(str, True),
-      'dest': MissionParam(Waypoint, True),
-      'delivery': MissionParam(str, True, 'deliver'),
-      'contract': MissionParam(Contract, False)
-    }
-  
-  def steps(self):
-    return {
-      **self.travel_steps('to', 'site', 'load'),
-      'load': (self.step_load, 'travel-back'),
-      **self.travel_steps('back', 'dest', 'load'),
-      'unload': (self.step_unload, 'travel-to'),
-    }
-
-class TravelMission(BaseMission):
-  def start_state(self):
-    return 'travel-to'
-  
-  @classmethod
-  def params(cls):
-    return {
-      'dest': MissionParam(Waypoint, True)
-    }
-  
-  def steps(self):
-    return self.travel_steps('to', 'dest', 'done')
-    
-def create_mission(mtype, ship, store, api):
-  types = {
-    'survey': SurveyMission,
-    'mine': MiningMission,
-    'haul': HaulMission,
-    'travel': TravelMission
-  }
-  if mtype not in types:
-    logging.warning(f'invalid mission type {mtype}')
-    return
-  m = types[mtype](ship, store, api)
-  return m
diff --git a/nullptr/missions/haul.py b/nullptr/missions/haul.py
new file mode 100644
index 0000000..8072247
--- /dev/null
+++ b/nullptr/missions/haul.py
@@ -0,0 +1,25 @@
+from nullptr.missions.base import BaseMission, MissionParam
+from nullptr.models.waypoint import Waypoint
+from nullptr.models.survey import Survey
+from nullptr.models.contract import Contract
+class HaulMission(BaseMission):
+  def start_state(self):
+    return 'travel-to'
+  
+  @classmethod
+  def params(cls):
+    return {
+      'site': MissionParam(Waypoint, True),
+      'resource': MissionParam(str, True),
+      'dest': MissionParam(Waypoint, True),
+      'delivery': MissionParam(str, True, 'deliver'),
+      'contract': MissionParam(Contract, False)
+    }
+  
+  def steps(self):
+    return {
+      **self.travel_steps('to', 'site', 'load'),
+      'load': (self.step_load, 'travel-back'),
+      **self.travel_steps('back', 'dest', 'load'),
+      'unload': (self.step_unload, 'travel-to'),
+    }
diff --git a/nullptr/missions/mine.py b/nullptr/missions/mine.py
new file mode 100644
index 0000000..3c8b53e
--- /dev/null
+++ b/nullptr/missions/mine.py
@@ -0,0 +1,78 @@
+from nullptr.missions.base import BaseMission, MissionParam
+from nullptr.models.waypoint import Waypoint
+from nullptr.models.survey import Survey
+from nullptr.models.contract import Contract
+
+class MiningMission(BaseMission): 
+  @classmethod
+  def params(cls):
+    return {
+      'site': MissionParam(Waypoint, True),
+      'resource': MissionParam(str, True),
+      'dest': MissionParam(Waypoint, True),
+      'delivery': MissionParam(str, True, 'deliver'),
+      'contract': MissionParam(Contract, False)
+    }
+  
+  def start_state(self):
+    return 'travel-to'
+    
+  def steps(self):
+    return {
+      **self.travel_steps('to', 'site', 'extract'),
+      'extract': (self.step_extract, {
+        'done': 'dock',
+        'more': 'extract'
+      }),
+      'dock': (self.step_dock, 'sell'),
+      'sell': (self.step_sell, {
+        'more': 'sell',
+        'done': 'orbit',
+      }),
+      'orbit': (self.step_orbit, 'jettison'),
+      'jettison': (self.step_dispose, {
+        'more': 'jettison',
+        'done': 'extract',
+        'full': 'travel-back'
+      }),
+      **self.travel_steps('back', 'dest', 'unload'),
+      'unload': (self.step_unload, {
+        'done': 'travel-to',
+        'more': 'unload'
+      }),
+    }
+  
+  def get_survey(self):
+    resource = self.st('resource')
+    site = self.rst(Waypoint,'site')
+    # todo optimize
+    for s in self.store.all(Survey):
+      if resource in s.deposits and site.symbol == s.waypoint():
+        return s
+    return None
+    
+  def step_extract(self):
+    survey = self.get_survey()
+    print('using survey:', str(survey)) 
+    result = self.api.extract(self.ship, survey)
+    symbol = sg(result,'extraction.yield.symbol')
+    units  = sg(result,'extraction.yield.units')
+    print('extracted:', units, symbol)
+    self.next_step = self.ship.cooldown
+    if self.ship.cargo_units < self.ship.cargo_capacity:
+      return 'more'
+    else:
+      return 'done'
+  
+  def step_dispose(self):
+    contract = self.rst(Contract, 'contract')
+    typs = self.ship.nondeliverable_cargo(contract)
+    if len(typs) > 0:
+      self.api.jettison(self.ship, typs[0])
+    if len(typs) > 1:
+      return 'more'
+    elif self.ship.cargo_units > self.ship.cargo_capacity - 3:
+      return 'full'
+    else:
+      return 'done'
+  
diff --git a/nullptr/missions/survey.py b/nullptr/missions/survey.py
new file mode 100644
index 0000000..2a41458
--- /dev/null
+++ b/nullptr/missions/survey.py
@@ -0,0 +1,15 @@
+from nullptr.missions.base import BaseMission, MissionParam
+
+class SurveyMission(BaseMission):
+  def start_state(self):
+    return 'survey'
+  
+  def steps(self):
+    return {
+      'survey': (self.step_survey, 'survey')
+    }
+  
+  def step_survey(self):
+    result = self.api.survey(self.ship)
+    #pprint(result, 2)
+    self.next_step = self.ship.cooldown
diff --git a/nullptr/missions/travel.py b/nullptr/missions/travel.py
new file mode 100644
index 0000000..93f74ba
--- /dev/null
+++ b/nullptr/missions/travel.py
@@ -0,0 +1,16 @@
+from nullptr.missions.base import BaseMission, MissionParam
+from nullptr.models.waypoint import Waypoint
+
+class TravelMission(BaseMission):
+  def start_state(self):
+    return 'travel-to'
+  
+  @classmethod
+  def params(cls):
+    return {
+      'dest': MissionParam(Waypoint, True)
+    }
+  
+  def steps(self):
+    return self.travel_steps('to', 'dest', 'done')
+