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Deep web is supposed to be full of useful databases for researchers. So no doubt you will find valuable resources on the internet.

I found a few other search engines that can be used. You can follow the following link to find out more
websearch.about.com/od/invisibleweb/tp/d...b-search-engines.htm

Indeed you will. The Deep Web is an estimated 500 times larger than our regular web. There are various search engines specializing in searching the Deep Web, but one of the best specializing in TOR (The Onion Router), is tor hidden service search Ahmia.fi hidden onion sites running inside Tor network.

Yes, I think you can. When I did a google search, I found the following link. Check that out.

oedb.org/ilibrarian/research-beyond-google/

Will I be able to find useful resources on the deep web to conduct research?