Who are the two Gaza flotilla activists abducted by Israel?

Two activists, Saif Abu Keshek and Thiago Avila, have been presented before an Israeli court after being detained by Israel in international waters near Greece. They were part of a Gaza-bound humanitarian flotilla that aimed to break an Israeli blockade of Gaza and bring supplies to the Palestinian territory. Abu Keshek, a Spanish-Swedish national of Palestinian origin, was abducted from the flotilla and subjected to torture on an Israeli military vessel. Both activists have been on a hunger strike during their detention, although they have continued to drink water.