In 2015 Gavan spent 8 weeks in Nepal high-altitude mountaineering. He climbed Ama Dablam (6, 857 m) with a joint Irish and Nepalese sherpa team. They successfully summited the notoriously technical peak in November climbing 19 hours on summit day from camp 2 at 5, 900 m through vertical pitches of Ice and Rock. Members of their team who have summited Everest regarded this as a much tougher mountain.
After some rest in Kathmandu, Gavan joined the Sherpa team from Ascent Himalaya and went to attempt a Winter Ascent on Annapurna (8,091m) known simply as the most dangerous mountain on earth. For every three climbers who summit, one dies trying. Not only that but they made the bold attempt to climb it in the middle of December and take a chance at being one of only a handful of mountaineers to make a winter ascent of an 8,000m peak.
Unfortunately they were battered by near hurricane force winds and had to abandon the expedition due to weather and team safety.