Shackleton selected the boat party: himself, Worsley, Crean, McNish, and sailors John Vincent and Timothy McCarthy. On instructions from Shackleton, McNish immediately set about adapting the James Caird, improvising tools and materials.[80][81] Wild was to be left in charge of the Elephant Island party, with instructions to make for Deception Island the following spring should Shackleton not return.[3] Shackleton took supplies for only four weeks, judging that if land had not been reached within that time the boat would be lost.[82]