Final answer:
The nature of the dramatic irony during the coach ride to the hotel involves the characters' mistaken belief that they are seeing a life-boat, which is actually an omnibus, and their contemplation of an uncertain rescue, highlighting themes of expectation versus reality and human fallibility.
Step-by-step explanation:
The dramatic irony in the coach ride to the hotel arises from the differences between the characters' perceptions and the reality they face. Specifically, there is a contradiction between what some characters believe to be a life-boat and what actually is an omnibus. This misunderstanding creates an undercurrent of humor and tension, revealing a deeper thematic exploration of expectation versus reality, human fallibility, and the often absurd nature of human situations. The passage involving the characters' resolve in the face of danger and their contemplation of fate's capriciousness also adds to this irony, as they prepare for a rescue that seems both certain and uncertain at the same time. The overarching awareness that they may not be saved after all their struggles creates a potent dramatic irony that engages the reader.