Clouds of volcanic gas rise from giant crater at Marum volcano, Ambrym Island, Vanuatu

Men stand on edge of giant crater at Marum volcano, Ambrym Island, Vanuatu

Climbers prepares to descend into active volcano and lava lake, Marum Volcano, Ambrym Island, Vanuatu

Climber admires spectacular volcanic eruption of lava, Marum Volcano, Ambrym Island, Vanuatu

Lava lake surges dramatically at night, Marum Volcano, Ambrym Island, Vanuatu

Volcano erupts very close to scientist, Marum Volcano, Ambrym Island, Vanuatu

Lava lake erupts violently at dusk inside active volcano, Marum Volcano, Ambrym Island, Vanuatu

Close up waves of lava flowing against cliff, Marum Volcano, Ambrym Island, Vanuatu

Close up of lava boiling vigorously in volcanic crater, Marum Volcano, Ambrym Island, Vanuatu

Volcanic gas streams from lava lake at night, Marum Volcano, Ambrym Island, Vanuatu

Medium shot of lava lake erupting violently, Marum Volcano, Ambrym Island, Vanuatu

Climber stands on ledge above dangerously erupting lava, Marum Volcano, Ambrym Island, Vanuatu

Climber prepares to descend into active volcano and lava lake, Marum Volcano, Ambrym Island, Vanuatu

Close up shot of sloshing lava lake at Marum volcano, Ambrym Island, Vanuatu

Climber prepares to descend into active volcano and lava lake, Marum Volcano, Ambrym Island, Vanuatu

Gas blows past climber standing above lava lake, Marum Volcano, Ambrym Island, Vanuatu

Volcanologist descends into violently erupting volcano, Marum Volcano, Ambrym Island, Vanuatu

Close up large waves of lava erupting from volcano, Marum Volcano, Ambrym Island, Vanuatu

Volcanologist stands on cliff with large eruption of lava behind, Marum Volcano, Ambrym Island, Vanuatu

Climber rests on cliff above erupting lava lake, Marum Volcano, Ambrym Island, Vanuatu

Lava erupts from volcano behind climber, Marum Volcano, Ambrym Island, Vanuatu

Man climbs on cliff overlooking erupting volcano, Marum Volcano, Ambrym Island, Vanuatu

Man stands on cliff overlooking active volcano lava lake, Marum Volcano, Ambrym Island, Vanuatu

Large chunk of rock collapses into lava lake near volcanologist, Marum Volcano, Ambrym Island, Vanuatu