Ultima VI: The False Prophet/The Shrine of Valor

Jhelom
There are two ways to get to Jhelom. The most obvious is to buy a frigate and cross the sea from Trinsic to the South and to the West.

The other option is an underground tunnel. From Trinsic walk East along the northern limit of the swamp, and you'll get to the entrance of the Heroes' Hole. From there, walk underground to the West. At the third fork, turn South into an alcove with a stepladder: the Companions will exit from Heftimus' Cave in Jhelom. Still, buying at least a skiff will be necessary to get to the Shrine of Valor.