Panagoulis was captured a few hours later in a nearby sea cave , since the boat sent to help him escape was instructed to leave at a specific time .
He could n't swim there on time due to strong sea currents .
Panagoulis was captured a few hours later in a nearby sea cave , since the boat sent to help him escape was instructed to leave at a specific time and he could n't swim there on time due to strong sea currents .