Unless you have a pet purple worm* I don't think it's that easy to dig through solid rock.
Whenever someone wants to complain about fantasy maps not making sense, I point them at this article by James Sutter about New Orleans.
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Someone Just Pointed Out How Messed Up New Orleans Map Is And Now We Can’t Unsee It
Last week, James L. Sutter, a 34-year-old game designer and author, took to Twitter to share his critique on the real map of New Orleans. Sutter, best known as the co-creator of the Pathfinder Roleplaying Game, an expansion to Dungeons and Dragons 3rd edition, took a look at New Orleans as if it...www.boredpanda.com
My experience with sailing ships is limited to a tour of the replica-Mayflower.It's very much like ship maps. If you look at most ship maps for D&D, they are WAYY too big. The Sea Ghost from Ghosts of Saltmarsh is about 3 times bigger than it should be. It's a 90 foot Hansa Cog, when Hansa cogs were usually about 30 feet long. It's MASSIVE. But, needs must when you're trying to run an adventure on the ship. If you actually have a realistically scaled sailing ship, it's almost impossible to run 5e combat on it. So, you have a choice - bigger ship or boring encounter.
OTOH, it might be fun to create an encounter where size restrictions on a ship heavily influence strategy.It's very much like ship maps. If you look at most ship maps for D&D, they are WAYY too big. The Sea Ghost from Ghosts of Saltmarsh is about 3 times bigger than it should be. It's a 90 foot Hansa Cog, when Hansa cogs were usually about 30 feet long. It's MASSIVE. But, needs must when you're trying to run an adventure on the ship. If you actually have a realistically scaled sailing ship, it's almost impossible to run 5e combat on it. So, you have a choice - bigger ship or boring encounter.
OTOH, it might be fun to create an encounter where size restrictions on a ship heavily influence strategy.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.