Lures prey with bacterial lanterns. Your floodlight lure draws them close; sonar scatters them deep.
Silver schools migrate 1 km nightly. They flee the lamp cone but swarm a sonar ping's edge.
A colony acting as one animal, trailing 40 m of stinging thread. Only appears below 3,000 m.
Dead plankton drifts down like weather. The snow slider thickens the fall; hadal zones bury it.
Every 10 metres adds one bar — about one elephant standing on your thumbnail. Type any depth and feel the squeeze.
Human submersible rated 4,500 m. Titanium sphere, three portholes, one robotic arm.
Reached Challenger Deep in 1960. The crew heard the hull groan and kept descending.
Divers hang cups outside the sub. Pressure crushes them into souvenirs.