Marlin definitely can be found deep where swordfish roam. I recall a story out of Bimini several years ago where some dude was deep-dropping off Gun Cay got nailed on the way down. Some how, some way, it turns out a Marlin slammed into the weight and broke its bill off leaving it impaled in the sash weight. The guy took it somewhere and it was identified as a marlin bill.
Nice catch. I've heard some chatter on some blues being caught too of late.
High tides!