narrow tunnels

to make caving more fun, add a few narrow tunnels between large caves(or sometimes geodes) ,don't extend them too far! three to one block wide ,with very bumpy ups and downs, and with a maximum height of 3.5 blocks and minimum of 1 block, add stone slabs or stairs in the tunnels so you may need to crawl or mine through, one block height so you need to crawl, swim or mine