Perilous Plunge was created in 2000.

The word 'plunge' can be a noun or a verb, and the words are directly related. A plunge is a fall, often meaning a high or dangerous one, such as from a cliff. To plunge is to fall, or metaphorically do so (e.g. to plunge headlong into conflicts).

Yes, the word plunge (plunges) is a noun as well as a verb (plunge, plunges, plunging, plunged). Example uses:

Noun: The plunge into the icy water was a shock to my system.

Verb: Don't plunge into a business venture without doing some research.

The plunge is about 100 feet and its not straight down.