diff --git a/src/game.cpp b/src/game.cpp
index 4047562927426..18438d776815b 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -9931,6 +9931,33 @@ void game::vertical_move( int movez, bool force )
         }
     }
 
+    // > and < are used for diving underwater.
+    if( m.has_flag( "SWIMMABLE", u.pos() ) && m.has_flag( TFLAG_DEEP_WATER, u.pos() ) ) {
+        if( movez == -1 ) {
+            if( u.is_underwater() ) {
+                add_msg( m_info, _( "You are already underwater!" ) );
+                return;
+            }
+            if( u.worn_with_flag( "FLOTATION" ) ) {
+                add_msg( m_info, _( "You can't dive while wearing a flotation device." ) );
+                return;
+            }
+            u.set_underwater( true );
+            ///\EFFECT_STR increases breath-holding capacity while diving
+            u.oxygen = 30 + 2 * u.str_cur;
+            add_msg( _( "You dive underwater!" ) );
+        } else {
+            if( u.swim_speed() < 500 || u.shoe_type_count( "swim_fins" ) ) {
+                u.set_underwater( false );
+                add_msg( _( "You surface." ) );
+            } else {
+                add_msg( m_info, _( "You try to surface but can't!" ) );
+            }
+        }
+        u.moves -= 100;
+        return;
+    }
+
     // Force means we're going down, even if there's no staircase, etc.
     bool climbing = false;
     int move_cost = 100;
@@ -10042,33 +10069,6 @@ void game::vertical_move( int movez, bool force )
         u.moves -= 100;
     }
 
-    // > and < are used for diving underwater.
-    if( m.has_flag( "SWIMMABLE", u.pos() ) && m.has_flag( TFLAG_DEEP_WATER, u.pos() ) ) {
-        if( movez == -1 ) {
-            if( u.is_underwater() ) {
-                add_msg( m_info, _( "You are already underwater!" ) );
-                return;
-            }
-            if( u.worn_with_flag( "FLOTATION" ) ) {
-                add_msg( m_info, _( "You can't dive while wearing a flotation device." ) );
-                return;
-            }
-            u.set_underwater( true );
-            ///\EFFECT_STR increases breath-holding capacity while diving
-            u.oxygen = 30 + 2 * u.str_cur;
-            add_msg( _( "You dive underwater!" ) );
-        } else {
-            if( u.swim_speed() < 500 || u.shoe_type_count( "swim_fins" ) ) {
-                u.set_underwater( false );
-                add_msg( _( "You surface." ) );
-            } else {
-                add_msg( m_info, _( "You try to surface but can't!" ) );
-            }
-        }
-        u.moves -= 100;
-        return;
-    }
-
     // Shift the map up or down
 
     std::unique_ptr<map> tmp_map_ptr;