diff --git a/1626/i/2013-BL-01.jpg b/1623/i/2013-BL-01.jpg
similarity index 100%
rename from 1626/i/2013-BL-01.jpg
rename to 1623/i/2013-BL-01.jpg
diff --git a/1626/l/2013-BL-01.html b/1623/l/2013-BL-01.html
similarity index 100%
rename from 1626/l/2013-BL-01.html
rename to 1623/l/2013-BL-01.html
diff --git a/1626/t/2013-BL-01.jpg b/1623/t/2013-BL-01.jpg
similarity index 100%
rename from 1626/t/2013-BL-01.jpg
rename to 1623/t/2013-BL-01.jpg
diff --git a/cave_data/1626-2013-BL-01.html b/cave_data/1623-2013-BL-01.html
similarity index 93%
rename from cave_data/1626-2013-BL-01.html
rename to cave_data/1623-2013-BL-01.html
index d992e6e22..85107d90f 100644
--- a/cave_data/1626-2013-BL-01.html
+++ b/cave_data/1623-2013-BL-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>1626-2013-BL-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>1623-2013-BL-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>Dwarf Death-wish hole</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
 
@@ -39,14 +39,14 @@ code used in the Austrian kataster e.g '1/S +' - https://expo/.survex.com/katast
 <unofficial_number>2013-BL-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>1626-2013-BL-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 -->
-  <!-- DEBUG  1626-2013-BL-01+1626-2013-BL-01 'Z' == -->
+  <entranceslug>1623-2013-BL-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 -->
+  <!-- DEBUG  1623-2013-BL-01+1623-2013-BL-01 'Z' == -->
   <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>
 
 <explorers></explorers><!-- 'CUCC Expo' and year(s) of exploration. To distinguish from caves explored by foreign groups. Individual names can be given too if it was a small cave. -->
 <survex_file></survex_file><!-- Name of top-level survey file for this cave. Relative to the 'loser' survex repository. So for most caves that's "caves-162x/cavenum/cavnum.svx". (e.g. caves-1623/204/204.svx -->
-<underground_description><a href='/1626/l/2013-BL-01.html'><img src='/1626/t/2013-BL-01.jpg' /></a><br />
+<underground_description><a href='/1623/l/2013-BL-01.html'><img src='/1623/t/2013-BL-01.jpg' /></a><br />
 Crawl down would suit an emaciated dwarf with a death wish.</underground_description><!-- Underground description. (description of approach and entrance goes in entrance file). For a small cave this will be the entire description. For larger caves it will be the front page of the description, or a short intro, containing links to other pages with the cave description in, or even nothing but a link. -->
 <equipment></equipment><!-- For a small cave, summary of gear needed to descend. For longer caves it could be blank, a table, or just refer to the description/topos. Leave blank if this info is in the description. -->
 <references>See wallet <a href="/walletedit/2013:02">2013#02</a></references><!-- References to documentation. Could be Journal articles or Logbook entries. Can be links if the docs are online. -->
@@ -59,7 +59,7 @@ Crawl down would suit an emaciated dwarf with a death wish.</underground_descrip
 <extent></extent>
 
 <description_file></description_file><!-- Path of top-level description file for this cave, when a separate file is used. Otherwise blank. -->
-<url>1626/2013-BL-01/2013-BL-01.html</url><!-- (Required). Relative URL of this cave. i.e the URL this cave appears at on the website, not including 'https://expo.survex.com/. Normally area/cavenum., e.g ('1623/000')-->
+<url>1623/2013-BL-01/2013-BL-01.html</url><!-- (Required). Relative URL of this cave. i.e the URL this cave appears at on the website, not including 'https://expo.survex.com/. Normally area/cavenum., e.g ('1623/000')-->
 </cave>
 </body>
 </html>
diff --git a/entrance_data/1626-2013-BL-01.html b/entrance_data/1623-2013-BL-01.html
similarity index 97%
rename from entrance_data/1626-2013-BL-01.html
rename to entrance_data/1623-2013-BL-01.html
index a8aae397b..f4a0e7563 100644
--- a/entrance_data/1626-2013-BL-01.html
+++ b/entrance_data/1623-2013-BL-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>1626-2013-BL-01</slug> <!-- one entrance and one slug per entrance_data file -->
+<slug>1623-2013-BL-01</slug> <!-- one entrance and one slug per entrance_data file -->
 <name></name>
 <entrance_description></entrance_description>
 <explorers></explorers>