diff --git a/core/views_survex.py b/core/views_survex.py
index 3b4fe43..76b4851 100644
--- a/core/views_survex.py
+++ b/core/views_survex.py
@@ -8,7 +8,7 @@ from django.http import HttpResponseRedirect, HttpResponse
 from django.shortcuts import render_to_response, render
 #from django.core.context_processors import csrf
 from django.template.context_processors import csrf
-
+from django.core.exceptions import ObjectDoesNotExist
 from django.http import HttpResponse, Http404
 
 import troggle.settings as settings
@@ -295,6 +295,7 @@ def identifycavedircontents(gcavedir):
 
 # direct local non-database browsing through the svx file repositories
 # perhaps should use the database and have a reload button for it
+# why is caves-1623 HARD CODED here ?! That must be wrong..
 def survexcaveslist(request):
     cavesdir = os.path.join(settings.SURVEX_DATA, "caves-1623")
     #cavesdircontents = { }
@@ -312,6 +313,7 @@ def survexcaveslist(request):
     for num, cavedir in fnumlist:
         
         # these have sub dirs /cucc/ /arge/ /old/ but that is no reason to hide them in this webpage
+        # so these are now treated the same as 142 and 113 which also had a /cucc/ sub dir
         #if cavedir in ["144", "40"]: 
         #    continue
             
@@ -350,9 +352,20 @@ def survexcaveslist(request):
 # doesn't use recursion.  just writes it twice
 
 # currently not showing Explorers or Titles. link test from SurvexFile page is "dates and explorers"
+# Should explicity fix the kataster number thing.
 def survexcavesingle(request, survex_cave):
     breload = False
-    cave = Cave.objects.get(kataster_number=survex_cave)
     if breload:
         parsers.survex.ReloadSurvexCave(survex_cave) # does not exit now, needs re-writing to work.
-    return render_to_response('svxcavesingle.html', {'settings': settings, "cave":cave })
+    try:
+        cave = Cave.objects.get(kataster_number=survex_cave)
+        return render_to_response('svxcavesingle.html', {'settings': settings, "cave":cave })
+    except ObjectDoesNotExist:
+        # can get here if the survex file is in a directory labelled with unofficial number not kataster number.
+        cave = Cave.objects.get(unofficial_number=survex_cave)
+        return render_to_response('svxcavesingle.html', {'settings': settings, "cave":cave })
+        # should produce useful error message for person trying to upload or manage survex files
+    except:
+        raise Http404()
+ 
+        
diff --git a/templates/svxfilecavelist.html b/templates/svxfilecavelist.html
index 2f80d46..3eb0701 100644
--- a/templates/svxfilecavelist.html
+++ b/templates/svxfilecavelist.html
@@ -7,7 +7,7 @@
 {% block content %}
 <p><a href="#cdir">caves with subdirectories</a> | <a href="#cmult">caves with multiple files</a> | <a href="#csing">caves with single files</a></p>
 
-<h3><a href="/survexfile/all.svx">Link to all.svx for processing</a></h3>
+<!-- <h3><a href="/survexfile/all.svx">Link to all.svx for processing</a></h3> <!-- This is not right...-->
 
 <h2 id="cdir">Caves with subdirectories</h2>