The security personnel then board the boat with the bags of cash and enough weaponry to keep it safe.

BBC: Guns and soldiers on the high seas

Kenyan officials said Kenyan navy personnel pursued the attackers in their high-speed boat, engaging in a shootout, but the gang managed to cross the border back into Somalia.

CNN: STORY HIGHLIGHTS

That's why many top-tier villas come with phalanxes of personnel and also offer private transport -- via luxury car, boat or helicopter -- to zip guests anyplace they desire.

CNN: Five of the world's most opulent villas