He made first ascents of many peaks and routes in the Rocky Mountains, particularly in Colorado, including Lizard Head in the San Juan Mountains, Ellingwood Ridge on La Plata Peak in the Sawatch Range, and Crestone Needle in the Sangre de Cristo Range.
Having departed Brest for the last time on 10 August 1944, U-218 laid mines near Lizard Head (Cornwall), before retracing her course west of Ireland.
By April 1945, nine different fields (Serial B1, part 1 to 4, Serial B2, part 1 to 4, and Serial B3, part 1), comprising 900 Mk XVII/XVII(8) mines were laid off Lizard Head.
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