Crucible of Chaos Question

[Tarondor]

SPOILERS:

Is there access into the invisible bridges and thus into the Aeromantic Infandibulum from the interior of the four towers to which the bridges connect? Seems obvious, but no mention of the bridge access is made in the tower descriptions.

[animorphal]

Hello, I need your help. I will soon play "the crucible of chaos" but two points undermine my understanding of the scenario:
1- Who cultivate the fields around the city?
2 - Where is the tribe of derhii?
Thank you in advance for your answers.

[Mavrickindigo]

When I played it, I just had the players climb up there. There's no specifics for the towers, iirc, but other parts suggest that climbing is possible from within, at least from how I understand it.

As for Animorphal's questions

1. The Lizardfolk
2. I don't think it's mentioned on the map. They're just not where the players would go, but can magically hear the call when the time is right.