Fantasy - Group of people find a secret entrance to a tunnel leading to some underworld location. Read in 1970s.

[Sven]

- Memories about the book are vague and may overlap with other books.
- Book was in my junior high school library in the mid 70s so probably 1975 or older
- Cover may have had an embossed melting eye?
- Book seemed to be old even back them but everything seems old to a 13 year old.

[Cycad]

The Gammage Cup by Carol Kendall?

[Sven]

Cycad wrote: "The Gammage Cup by Carol Kendall?"

Don't think so based on the plot but I did remember this one when I saw a picture of the cover. Thanks for that.