Ex-astronaut Kathy Sullivan dives to deepest known point on Earth

The video covers an undersea exploration by Victor Viscovo and Kathy Sullivan, the first American woman to walk in space. They dived into the Challenger Deep, the deepest known spot on Earth, capturing images aboard the Limiting Factor, a submersible designed to withstand extreme pressure. After their dive, they communicated with astronauts aboard the International Space Station, which was orbiting 409 kilometers above Earth.

What is the name of the deep-sea research submersible mentioned in the text?

How did Sullivan and Viscovo communicate with the astronauts in the International Space Station?