Is it's hidden, does it act like a mine, detonating if something comes into contact with it? I'd imagine so but I don't see any indication
I don't like splitting the post-launch functionality between two buttons. Perhaps it's hidden by holding right click for a second (or however long), but if you hold for shorter than that, it detonates with power proportional to how long right click was held down. I think the re/destabilization mechanics are a bit complicated, perhaps take that out and just have 15 seconds = boom, or detonate on right click?
Having a really complicated and feature-rich weapon does sound cool, but it pretty much makes its use into a dedicated role, which pretty much requires a team based gamemode with other weapons that also require the same. Not really something I've ever seen a BL game mode do
Perhaps a shorter name? I don't think the full name would fit in the tool menu and I hate abbreviated names unless it's commonly known what the abbreviation stands for.
Also I don't really think the described behavior describes a
depth charge. Perhaps just 'mine'