These points are very important. If we take the Picos as an example most of the deep caves lie at 1 800m altitude and above so the air is thinner. Often long walks are necessitated from the nearest point of access or even the nearest suitable base camp. Water supply can be a problem. It can be unbearably hot during the day and very cold at night.
Violent thunderstorms occur regularly throughout the summer months.
Below 2000m altitude mist comes down for days obscuring virtually all vision. In winter the whole landscape is under metres of snow. As for the caves, these are nearly all vertical with sections of tight horizontal passages, loose rock, difficult rigging and some very big drops. So be realistic with the team experience and the numbers required. A reconnaissance or preliminary exploration trip is probably best achieved with a small group of experienced cavers.