Experienced mountaineer Sibusiso Vilane was emotional on his return to South Africa on Wednesday evening as he apologised to the nation for losing a climber on a trek he was leading in honour of International Nelson Mandela Day. Gugu Zulu‚ a racing driver‚ died on Monday. He and his wife Letshego were part of a group of 42 climbers that flew out from Johannesburg's OR Tambo airport in mid-July to take part in the 2016 Trek4Mandela Challenge.Sisters reunite after doomed charity climb on Mount Kilimanjaro"I have no words. I salute her‚" Tsholofelo Molefe said of her sister Tebogo Molefe who was part of the Trek4Mandela expedition. Vilane‚ who led the team‚ said Zulu had complained at the weekend of a scratchy throat‚ and thought he may be getting flu. These symptoms were common on a climb and he would have sent Zulu down the mountain had he realised he was sick. When his condition worsened‚ they did everything they could to get Zulu the help he needed‚ to no avail.Families wait for Trek4Mandela expedition participants at airportFamily members of the trekkers who took part in the Trek4Mandela expedition during which racing driver Gugu Zulu died‚ waited at the arrivals section at OR Tambo international Airport to welcome their loved ones on Wednesday evening. "I'm very sorry. I've not slept since Gugu Zulu's death...”“The entire nation has lost‚” Vilane said‚ commenting on the loss of a renowned sportsman.South African officials have been working with Tanzanian authorities to bring Zulu’s body back home‚ but there has been no word on when this will happen...