noun / verb
swarm
SWORM/swɔːrm/
A large, crowded group, or to gather or move in one.
A swarm of bees gathers around a branch overhead.

Etymology
Old English swearm named a mass of bees as well as a multitude. The insect-group sense extended to people gathered in a large, dense throng.
In context
there's no way they survive this this is just not happening it's like a swarm of locust but underwater and they're big people size zombies
More examples
- Fans swarm the gates as soon as they open.
- A swarm of reporters waits outside the courthouse.
- The picnic area is swarming with mosquitoes.
Forms
swarm · swarms · swarmed · swarming