Refer to the passage below and then answer the question afterwards in the same language as the passage:

Passage: The passengers were unharmed but had to trek across difficult terrain and with low food supplies for 11 days to make their way off the tepui and down to the nearest settlement at Kamarata. When word got out of their exploits, international interest in the Gran Sabana region increased dramatically, leading to in-depth scientific exploration in the following years.

Question: Which problems did the passengers face?
trek across difficult terrain and with low food supplies