He'd expected something like this, an attempt to slip some planes past the main body at extreme low altitude.

Research also indicates elevated risk of permanent brain damage in people climbing to extreme altitudes.

The advice adds that the extreme altitude in Tibet may cause sickness.

Despite of the extreme altitude the lake is rich in fish, among others salmon and trout are found are.

However, due to the extreme altitude, it is unlikely that they will be able to harbour any form of Martian life.

The processes by which clouds form at such extreme altitudes are not fully understood.

Unfortunately, the planes were not able to hit anything from such extreme altitudes.

Had flying not been prohibited by the lack of oxygen at that extreme altitude, it would still be impossible now.

To a foreign traveller in Bolivia, coping means dealing with the extreme altitude.

However, later on a fast jet had attempted a flight below the extreme altitude of the photographic planes.