diff --git a/cave_data/1626-2018-MS-01.html b/cave_data/1623-2018-MS-01.html
similarity index 97%
rename from cave_data/1626-2018-MS-01.html
rename to cave_data/1623-2018-MS-01.html
index 74cc89f19..75798a15c 100644
--- a/cave_data/1626-2018-MS-01.html
+++ b/cave_data/1623-2018-MS-01.html
@@ -17,9 +17,9 @@ the form documented at
 
 <cave>
 <non_public>False</non_public><!-- 'False' or 'True'. True if the cave should only be visible to logged-in users. Caves are normally public, so enter 'False' unless you know otherwise. -->
-<caveslug>1626-2018-MS-01</caveslug><!--(Required). Internal I.D. used to refer to this cave in entrance data files. Typically the same as the filebase, e.g. '1623-195'  -->
+<caveslug>1623-2018-MS-01</caveslug><!--(Required). Internal I.D. used to refer to this cave in entrance data files. Typically the same as the filebase, e.g. '1623-195'  -->
 <official_name></official_name><!-- Name of the cave (normally in German)  Use &uuml; for u+Umlaut and &ouml; for o+umlaut eg H&ouml;hle for Hohle and Gl&uuml;ck for Gluck-->
-<area>1626</area><!-- e.g. "1623" -->
+<area>1623</area><!-- e.g. "1623" -->
 <kataster_code>-</kataster_code><!-- 'length-or-depth/type exploration'
 code used in the Austrian kataster e.g '1/S +' - https://expo/.survex.com/katast.htm
 
@@ -39,7 +39,7 @@ code used in the Austrian kataster e.g '1/S +' - https://expo/.survex.com/katast
 <unofficial_number>2018-MS-01</unofficial_number><!-- (Either this or kataster_number is required). Initial temporary cave ID used until kataster number is allocated e.g. '2012-DD-01'-->
 
 <entrance>
-  <entranceslug>1626-2018-MS-01</entranceslug><!-- Internal ID to refer to each entrance instance in the entrance files (typically the same as that filename (e.g. 1623-161c). Matches the 'slug' field in the entrance file -->
+  <entranceslug>1623-2018-MS-01</entranceslug><!-- Internal ID to refer to each entrance instance in the entrance files (typically the same as that filename (e.g. 1623-161c). Matches the 'slug' field in the entrance file -->
   <letter></letter><!--Leave blank for single-entrance cave. If there is more than one entrace then the letter needs to be given. Generally matches the entranceslug ID.  -->
 </entrance>
 
diff --git a/entrance_data/1626-2018-MS-01.html b/entrance_data/1623-2018-MS-01.html
similarity index 97%
rename from entrance_data/1626-2018-MS-01.html
rename to entrance_data/1623-2018-MS-01.html
index ed8a877b3..1ca47cb60 100644
--- a/entrance_data/1626-2018-MS-01.html
+++ b/entrance_data/1623-2018-MS-01.html
@@ -19,7 +19,7 @@ though, you do not need to do a data import as it happens automatically -->
 <br>
 <entrance>
 <non_public>False</non_public>
-<slug>1626-2018-MS-01</slug> <!-- one entrance and one slug per entrance_data file -->
+<slug>1623-2018-MS-01</slug> <!-- one entrance and one slug per entrance_data file -->
 <name>2018-MS-01</name>
 <entrance_description>Lost - due to garbage GPS numbers</entrance_description>
 <explorers></explorers>