diff --git a/README.md b/README.md
index de89422a..0109f739 100644
--- a/README.md
+++ b/README.md
@@ -984,30 +984,19 @@ where the default is "world":
 
 ### Downloadable world
 
-Instead of mounting the `/data` volume, you can instead specify the URL of
-a ZIP file containing an archived world. This will be downloaded, and
-unpacked in the `/data` directory; if it does not contain a subdirectory
-called `world/` then it will be searched for a file `level.dat` and the
-containing subdirectory renamed to `world`. This means that most of the
-archived Minecraft worlds downloadable from the Internet will already be in
-the correct format.
-
-The ZIP file may also contain a `server.properties` file and `modules`
-directory, if required.
+Instead of mounting the `/data` volume, you can instead specify the URL of a ZIP file containing an archived world. It will be searched for a file `level.dat` and the containing subdirectory moved to the directory named by `$LEVEL`. This means that most of the archived Minecraft worlds downloadable from the Internet will already be in the correct format.
 
     docker run -d -e WORLD=http://www.example.com/worlds/MySave.zip ...
 
-**NOTE:** Unless you also mount `/data` as an external volume, this world
-will be deleted when the container is deleted.
-
 **NOTE:** This URL must be accessible from inside the container. Therefore,
-you should use an IP address or a globally resolveable FQDN, or else the
+you should use an IP address or a globally resolvable FQDN, or else the
 name of a linked container.
 
+**NOTE:** If the archive contains more than one `level.dat`, then the one to select can be picked with `WORLD_INDEX`, which defaults to 1.
+
 ### Cloning world from a container path
 
-The `WORLD` option can also be used to reference a directory that will be used
-as a source to clone the world directory.
+The `WORLD` option can also be used to reference a directory or zip file that will be used as a source to clone or unzip the world directory.
 
 For example, the following would initially clone the world's content
 from `/worlds/basic`. Also notice in the example that you can use a
diff --git a/examples/docker-compose-world-download.yml b/examples/docker-compose-world-download.yml
new file mode 100644
index 00000000..5b334f67
--- /dev/null
+++ b/examples/docker-compose-world-download.yml
@@ -0,0 +1,11 @@
+version: "3.7"
+
+services:
+  mc:
+    image: itzg/minecraft-server
+    ports:
+      - 25565:25565
+    environment:
+      EULA: "TRUE"
+      VERSION: 1.7.2
+      WORLD: https://www.minecraftmaps.com/survival-maps/cube-survival/download
diff --git a/start-deployVanilla b/start-deployVanilla
index e5dd91c3..0c161639 100644
--- a/start-deployVanilla
+++ b/start-deployVanilla
@@ -1,6 +1,7 @@
 #!/bin/bash
 
 . /start-utils
+isDebugging && set -x
 set -o pipefail
 
 export SERVER="minecraft_server.${VANILLA_VERSION// /_}.jar"
@@ -39,5 +40,7 @@ if [ ! -e $SERVER ] || [ -n "$FORCE_REDOWNLOAD" ]; then
   fi
 fi
 
+isDebugging && ls -l
+
 # Continue to Final Setup
 exec /start-finalSetup01World $@
diff --git a/start-finalSetup01World b/start-finalSetup01World
index 6ef57f19..1a0bd753 100644
--- a/start-finalSetup01World
+++ b/start-finalSetup01World
@@ -1,6 +1,8 @@
 #!/bin/bash
 
 . /start-utils
+set -e
+isDebugging && set -x
 
 if [ $TYPE = "FEED-THE-BEAST" ]; then
   worldDest=$FTB_BASE_DIR/$LEVEL
@@ -8,46 +10,45 @@ else
   worldDest=/data/$LEVEL
 fi
 
-# If no world exists and a URL for a world is supplied, download it and unpack
 if [[ "$WORLD" ]] && [ ! -d "$worldDest" ]; then
-case "X$WORLD" in
-  X[Hh][Tt][Tt][Pp]*)
-    log "Downloading world from $WORLD"
-    curl -sSL -o - "$WORLD" > /data/world.zip
+  if isURL $WORLD; then
+    curl -fsSL "$WORLD" -o /tmp/world.zip
+    zipSrc=/tmp/world.zip
+  elif [[ "$WORLD" =~ .*\.zip ]]; then
+    zipSrc="$WORLD"
+  fi
+
+  if [[ "$zipSrc" ]]; then
     log "Unzipping world"
-    unzip -o -q /data/world.zip
-    rm -f /data/world.zip
-    if [ ! -d $worldDest ]; then
-      log World directory not found
-      for i in /data/*/level.dat; do
-        if [ -f "$i" ]; then
-          d=`dirname "$i"`
-          log Renaming world directory from $d
-          mv -f "$d" $worldDest
-        fi
-      done
-    fi
-    if [ "$TYPE" = "SPIGOT" ]; then
-      # Reorganise if a Spigot server
-      log "Moving End and Nether maps to Spigot location"
-      [ -d "$worldDest/DIM1" ] && mv -f "$worldDest/DIM1" "/data/${LEVEL}_the_end"
-      [ -d "$worldDest/DIM-1" ] && mv -f "$worldDest/DIM-1" "/data/${LEVEL}_nether"
-    fi
-    ;;
-  *)
-    if [[ -d "$WORLD" ]]; then
-      if [[ ! -d "$worldDest" ]]; then
-        log "Cloning world directory from $WORLD ..."
-        cp -r "$WORLD" "$worldDest"
-      else
-        log "Skipping clone from $WORLD since $worldDest exists"
-      fi
+
+    # Stage contents so that the correct subdirectory can be picked off
+    mkdir -p /tmp/world-data
+    (cd /tmp/world-data && unzip -o -q "$zipSrc")
+
+    baseDirs=$(find /tmp/world-data -name "level.dat" -exec dirname "{}" \;)
+    count=$(echo "$baseDirs" | wc -l)
+    if [[ $count -gt 1 ]]; then
+      baseDir="$(echo "$baseDirs" | sed -n ${WORLD_INDEX:-1}p)"
+      baseName=$(basename "$baseDir")
+      log "WARN multiple levels found, picking: $baseName"
+    elif [[ $count -gt 0 ]]; then
+      baseDir="$baseDirs"
     else
-      log "World cloning source '$WORLD' doesn't seem to exist"
+      log "ERROR invalid world content"
       exit 1
     fi
-    ;;
-esac
+    mv "$baseDir" "$worldDest"
+  else
+    log "Cloning world directory from $WORLD ..."
+    cp -r "$WORLD" "$worldDest"
+  fi
+
+  if [ "$TYPE" = "SPIGOT" ]; then
+    # Reorganise if a Spigot server
+    log "Moving End and Nether maps to Spigot location"
+    [ -d "$worldDest/DIM1" ] && mv -f "$worldDest/DIM1" "/data/${LEVEL}_the_end"
+    [ -d "$worldDest/DIM-1" ] && mv -f "$worldDest/DIM-1" "/data/${LEVEL}_nether"
+  fi
 fi
 
 exec /start-finalSetup02Modpack $@