diff --git a/cave_data/1623-270.html b/cave_data/1623-270.html
index f451d3df1..539be8d96 100644
--- a/cave_data/1623-270.html
+++ b/cave_data/1623-270.html
@@ -25,7 +25,7 @@
 <underground_description>A large entrance visible from a considerable distance leads a few metres and turns a corner then apparently stops.  However there's a crawl on the right with a squeeze over a boulder which then opens out into a chamber with an animal skeleton (possibly a Gemse).  The passage stops a few metres further on.  Reportedly looked at by CUCC as far back as 1976 but the earliest documented exploration appears to be 1979-08-05.</underground_description>
 <equipment></equipment>
 <references>Email 2005-05-30 and 2006-06-21; 1979 log book</references>
-<survey><a href="/270/2004-03-plan-2015.pdf">Plan, drawn 2015<br /></a></survey>
+<survey><a href="/1623/270/2004-03-plan-2015.pdf">Plan, drawn 2015<br /></a></survey>
 <kataster_status></kataster_status>
 <underground_centre_line></underground_centre_line>
 <notes></notes>