Not too much out there on the internet about The Hidden Below, which is why I created this site. But I do have to mention a few great resources:
www.mobygames.com/game/dos/hidden-below/, THB's Mobygames page. Definitely a good starting point for learning about THB.
The Legacy's THB page has some nice screenshots and pictures of the packaging.
The hidden below - Level 1 - Gameplay (youtube), a link to one of 1337Shockwav3Games' videos on THB. Unfortunately he didn't record more than a couple levels,
but he did find some secrets I missed in the demo.
Dead Links (Can be partially viewed using the Internet Archive):
www.svatopluk.com/thb, one of the first English websites to mention the Hidden Below. I owe this guy a huge debt of gratitude for
making the demo available, which was what first sparked my interest in the game.
The old and new official Soft Enterprises websites.
That's it! If you know of any other websites with good info on THB, contact me at ecamber at thehiddenbelow.com.