Question Mark

Original Link
Posted on 26 June 2015
==Puzzle==
This Challenge will test your skills of lateral thinking: 
Dive!...Surface!...Dive!
Hint 1
When can a image have text that is not visible at the surface ?
Hint 2
You might now a message that needs a key. What about looking for that key in the original page ?
Solution
From the clue (Dive!...Surface!...Dive!) you open the image in a text editor to look inside it and find the following text at the end of the file:
 Riddle me this: When is my name not my name?
 XWT YIH AWS OYJ YQT DMT IFP
The Riddler’s other name is Edward “E.” Nigma, so you find an online Enigma Machine Simulator .
To find the correct settings, continue to look “under the surface” again (Dive!) and check the source code of the page itself. There, underneath a giant ascii question mark, you find the following comment:
 <--Here's what you're looking for!!  IV-V-I  YFD  XQO MP LX YJ SC EW AV OZ KR NQ TF -->
Entering the settings above into the simulator, along with the 3-letter groups from the image code as the message itself, returns the answer:
WAX CYL IND ERP HON OGR APH
WAX CYLINDER PHONOGRAPH
stl.la/waxcylinderphonograph
==Reward==
The SMS in Location Unknown
Category:June 2015
Category:Endgame - Ancient Truth
Category:Ancient Societies
Category:Blog
Category:Puzzle