Hi Austin. Welcome to Cavechat.
As I'm sure you've already noticed, there are a lot of cavers that live in Maryland, but there isn't much caving to be had in Maryland. Lots of small stuff, and not a whole lot of big stuff. I almost exclusively cave in Allegany County, Maryland, but that is because all of my "project caves" (in my case this means a cave that I discover, or dig to make bigger, and then survey it) are located there. Devil's Hole is a fun little trip, if you ever get the chance. I know a lot of great people associated with the Tri-State Grotto, so I also recommend it. I've also attended a Franklin County Grotto meeting once (which isn't too far away), and my overall impression was positive. I also recommend learning how to ascend and rappel a rope, as this will open up many additional caving opportunities for you.
Greg, there are actually five documented Snyder's Landing caves, but the longest is 350 feet. The longest McMahon cave is 550 feet.
What do you mean by "cave fish"?