National Geographic : 2001 Aug
LIKE A VAT OF ACID the milky blue water in Maly Semiachik's crater lake may be corrosive enough to dissolve the seams of a rubber boat. So Tessier and team member Irene Margaritis wrapped theirs in acid-resistant PVC plastic and paddled carefully to avoid splashing. Taking to the air in a motorized paraglider, Carsten Peter cruised over a broad outwash plain (bottom right) between volcanoes near Klyuchevskoy. Buffeted by erratic winds, Peter crash-landed repeatedly but was unfazed. Setting out after a rain to explore the seracs and crevasses of Mutnovsky glacier, Tessier (below) found himself mired in a slippery gumbo of ash on the slopes of the volcano.