diff --git a/src/main/java/org/gcube/dataanalysis/geo/utils/ThreddsDataExplorer.java b/src/main/java/org/gcube/dataanalysis/geo/utils/ThreddsDataExplorer.java
index f9c363d..42cec26 100644
--- a/src/main/java/org/gcube/dataanalysis/geo/utils/ThreddsDataExplorer.java
+++ b/src/main/java/org/gcube/dataanalysis/geo/utils/ThreddsDataExplorer.java
@@ -128,6 +128,7 @@ public class ThreddsDataExplorer {
 				int tsize = triplets.size();
 				long t01 = System.currentTimeMillis();
 				LatLonRect llr = null;
+				AnalysisLogger.getLogger().debug("Extracting subset...");
 				GridDatatype gdtsub = grid.makeSubset(new Range(time, time), null, llr, 1, 1, 1);
 				Array data = gdtsub.readVolumeData(time); // note order is t, z, y, x
 				int[] shapeD = data.getShape();