Measured in pennies per minutes, this was a compact but reasonably engaging tour about the history of Seattle's original Pioneer Square. Jennifer was well-informed and told the stories well, though "funny" would be an overstatement. The tour itself is slightly misnamed - it's not so much a tour about the underground crannies of Seattle as it is a tour of the history of Seattle's great fire, its causes and consequences, while using the underground spaces as visual show to their tell. If you are a history nerd, this is an easy win. (It pairs well with a visit to the Seattle MOHAI, which actually does have a very funny exhibit about the fire.) Just don't expect adventures through vast catacombs ala Indiana Jones.
We were not underground for the entire hour, we alternated going up to street level and then back down to new spaces as the story evolved. It gets a tad stuffy down there, so wear layers for divestment and pack your mask if close crowding still makes you uncomfortable. There's not much walking, but there is a lot of up and down on steep old steps, so definitely wear secure and comfy shoes. Wouldn't recommend if you get a lot of back or joint pain from stair climbing or long periods of standing. The timespan is short so it's kid-friendly, just make sure your kids are going to be well-behaved because even a slightly raised voice echoes pretty loudly.