"Boats are built to go in the water, not the air, so this operation scared me," said Iker Martinez, the Spanish skipper of leading boat Telefonica.
The latest measure is part of a multifaceted plan that includes introducing a large exclusion zone to keep boats from sailing through dangerous waters near Somalia's coast.
Telefonica lead the race by seven points from Camper after beating their rivals in the first stage of leg two.
The race is due to finish in Galway next July.
Aussies destroy India in first test
CRICKET: Australia's makeshift pace attack tore through India's formidable batting unit to secure a 122-run victory on the fourth day of the first test yesterday.
After leaving India reeling on 117-6 at tea, the hosts dismissed them for 169 at the Melbourne Cricket Ground to take a 1-0 lead in the four-match series.
NBA: Toronto 85 Indiana 90, Charlotte 95 Miami 96, Atlanta 101 Washington 83, Detroit 89 Cleveland 105, Memphis 95 Oklahoma City 98, New Orleans 97 Boston 78, San Antonio 115 LA Clippers 90, Denver 117 Utah 100, Phoenix 83 Philadelphia 103, Golden State 92 NY Knicks 78.