diff --git a/src/deepclone/controller/DeepcloneController.php b/src/deepclone/controller/DeepcloneController.php
--- a/src/deepclone/controller/DeepcloneController.php
+++ b/src/deepclone/controller/DeepcloneController.php
@@ -12,9 +12,11 @@
       return new Aphront404Response();
     }
 
-    $task = id(new ManiphestTaskQuery())
+    $query = new ManiphestTaskQuery();
+    $task = $query
       ->setViewer($viewer)
       ->withPHIDs(array($task_id))
+      ->withOpenSubtasks(true)
       ->requireCapabilities(
         array(
           PhabricatorPolicyCapability::CAN_VIEW,
@@ -29,83 +31,14 @@
       return new Aphront404Response();
     }
 
+    $transactions = id(new ManiphestTransactionQuery())
+      ->setViewer($request->getUser())
+      ->withObjectPHIDs(mpull([$task], 'getPHID'))
+      ->needComments(true)
+      ->execute();
+
     if ($request->isFormPost()) {
-      return $this->triggerTransaction($request, $task);
-      // $properties = $provider->readFormValuesFromRequest($request);
-      // list($errors, $issues, $properties) = $provider->processEditForm(
-      //   $request,
-      //   $properties);
-
-      // $xactions = array();
-
-      // if (!$errors) {
-      //   if ($is_new) {
-      //     if (!phutil_nonempty_string($config->getProviderType())) {
-      //       $config->setProviderType($provider->getProviderType());
-      //     }
-      //     if (!phutil_nonempty_string($config->getProviderDomain())) {
-      //       $config->setProviderDomain($provider->getProviderDomain());
-      //     }
-      //   }
-
-      //   $xactions[] = id(new PhabricatorAuthProviderConfigTransaction())
-      //     ->setTransactionType(
-      //       PhabricatorAuthProviderConfigTransaction::TYPE_LOGIN)
-      //     ->setNewValue($request->getInt('allowLogin', 0));
-
-      //   $xactions[] = id(new PhabricatorAuthProviderConfigTransaction())
-      //     ->setTransactionType(
-      //       PhabricatorAuthProviderConfigTransaction::TYPE_REGISTRATION)
-      //     ->setNewValue($request->getInt('allowRegistration', 0));
-
-      //   $xactions[] = id(new PhabricatorAuthProviderConfigTransaction())
-      //     ->setTransactionType(
-      //       PhabricatorAuthProviderConfigTransaction::TYPE_LINK)
-      //     ->setNewValue($request->getInt('allowLink', 0));
-
-      //   $xactions[] = id(new PhabricatorAuthProviderConfigTransaction())
-      //     ->setTransactionType(
-      //       PhabricatorAuthProviderConfigTransaction::TYPE_UNLINK)
-      //     ->setNewValue($request->getInt('allowUnlink', 0));
-
-      //   $xactions[] = id(new PhabricatorAuthProviderConfigTransaction())
-      //     ->setTransactionType(
-      //       PhabricatorAuthProviderConfigTransaction::TYPE_TRUST_EMAILS)
-      //     ->setNewValue($request->getInt('trustEmails', 0));
-
-      //   if ($provider->supportsAutoLogin()) {
-      //     $xactions[] = id(new PhabricatorAuthProviderConfigTransaction())
-      //       ->setTransactionType(
-      //         PhabricatorAuthProviderConfigTransaction::TYPE_AUTO_LOGIN)
-      //       ->setNewValue($request->getInt('autoLogin', 0));
-      //   }
-
-      //   foreach ($properties as $key => $value) {
-      //     $xactions[] = id(new PhabricatorAuthProviderConfigTransaction())
-      //       ->setTransactionType(
-      //         PhabricatorAuthProviderConfigTransaction::TYPE_PROPERTY)
-      //       ->setMetadataValue('auth:property', $key)
-      //       ->setNewValue($value);
-      //   }
-
-      //   if ($is_new) {
-      //     $config->save();
-      //   }
-
-      //   $editor = id(new PhabricatorAuthProviderConfigEditor())
-      //     ->setActor($viewer)
-      //     ->setContentSourceFromRequest($request)
-      //     ->setContinueOnNoEffect(true);
-
-      //   try {
-      //     $editor->applyTransactions($config, $xactions);
-      //     $next_uri = $config->getURI();
-
-      //     return id(new AphrontRedirectResponse())->setURI($next_uri);
-      //   } catch (Exception $ex) {
-      //     $validation_exception = $ex;
-      //   }
-      // }
+      return $this->triggerTransaction($request, $task, $transactions);
     } else {
       return $this->buildForm($task);
     }
@@ -121,8 +54,7 @@
           ->addCheckbox(
             'copy_comments',
             1,
-            pht('Copy all the comments of the task/s to the new task/s'),
-          )
+            pht('Copy all the comments of the task/s to the new task/s'))
       )
       ->appendChild(
         id(new AphrontFormCheckboxControl())
@@ -130,8 +62,7 @@
           ->addCheckbox(
             'deep_clone',
             1,
-            'Create a clone of all the sub tasks of this task',
-          )
+            'Create a clone of all the sub tasks of this task')
       );
 
     $handle = $this->getHandle($task);
@@ -178,12 +109,58 @@
     return $handle;
   }
 
-  private function triggerTransaction(AphrontRequest $request, ManiphestTask $task) {
+  private function triggerTransaction(AphrontRequest $request, ManiphestTask $task, array $transactions) {
     $deepCloneRaw = $request->getStr('deep_clone');
     $deepClone = $deepCloneRaw === '1';
     $copyCommentsRaw = $request->getStr('copy_comments');
     $copyComments = $copyCommentsRaw === '1';
 
-    throw new Exception("Deep Clone $deepClone $deepCloneRaw Copy Comments $copyComments $copyCommentsRaw");
+    $taskClone = new ManiphestTask();
+
+    $taskClone->setTitle($task->getTitle());
+    $taskClone->setDescription($task->getDescription());
+    $taskClone->setAuthorPHID($task->getAuthorPHID());
+    $taskClone->setOwnerPHID($task->getOwnerPHID());
+    $taskClone->setStatus($task->getStatus());
+    $taskClone->setPriority(ManiphestTaskPriority::getDefaultPriority());
+    $taskClone->setSubtype($task->getSubtype());
+    $taskClone->setViewPolicy($task->getViewPolicy());
+    $taskClone->setEditPolicy($task->getEditPolicy());
+
+    $taskClone->save();
+
+    $xactions[] = id(new ManiphestTransaction())
+      ->setTransactionType(PhabricatorCoreCreateTransaction::TRANSACTIONTYPE);
+    $xactions[] = id(new ManiphestTransaction())
+      ->setTransactionType(ManiphestTaskPriorityTransaction::TRANSACTIONTYPE)
+      ->setNewValue(
+        $task->getPriorityKeyword());
+
+    foreach ($transactions as &$transaction) {
+      if ($transaction->getTransactionType() !== 'core:comment') {
+        continue;
+      }
+
+      if ($copyComments === false) {
+        continue;
+      }
+
+      $transactionClone = id(new ManiphestTransaction())
+        ->setTransactionType(PhabricatorTransactions::TYPE_COMMENT);
+
+      $transactionClone->attachComment(
+        id(new ManiphestTransactionComment())
+          ->setContent($transaction->getComment()->getContent()));
+
+      $xactions[] = $transactionClone;
+    }
+
+    id(new ManiphestTransactionEditor())
+      ->setActor($this->getViewer())
+      ->setContentSourceFromRequest($request)
+      ->setContinueOnNoEffect(true)
+      ->applyTransactions($taskClone, $xactions);
+
+    return id(new AphrontRedirectResponse())->setURI($taskClone->getURI());
   }
 }