Swim streamer

From Openwaterpedia
Swim streamer used by Diana Nyad in the Straits of Florida between Havana, Cuba and Key West, Florida
night swim streamer at night with red LED lights on the cloth
Hoist and structure of the underwater swim streamer, photo courtesy of Christi Barli in the Straits of Florida

noun - A swim streamer (or sarashi or さらし (in Japanese) is a piece of cloth or illuminated material that is runs underneath an open water swimmer or parallel to an escort boat for the benefit of guiding and protecting an open water swimmer during an ocean swim or channel crossing.



The underwater swim streamer or night swim streamer cloth or material is used during daytime hours; the material is illuminated during the nighttime hours for easier viewing. The navigational aid is hoisted from the escort boat and anchored in the water so the cloth or material runs 1-3 meters underneath the surface of the water.


The swim streamer can serve to help guide the swimmer and/or as a shark deterrent if the swimmer swims directly above the submerged swim streamer.


Diana Nyad used a swimmer's streamer during her swim from Cuba to Florida.


  • The marathon swimmer can look straight down in the water at the swim streamer on every stroke in order swim straight (i.e., parallel to the escort boat).
  • The swimmer can also conserve energy and improve their navigational course by not constantly looking up at the boat, especially during the night.
  • Sharks can be deterred by its proximity to the swimmer.

Use Around The World

Video of Swim Streamer in Tsugaru Channel and Sado Channel

The swim streamer and the pole of the swim streamer can be seen in the videos of the Tsugaru Channel and Sado Channel crossings.


Swimmer's streamer, Swimmer's guide, sarashi (さらし in Japanese), underwater streamer, streamer, night swim streamer, underwater swim streamer, on-the-water swim streamer

On-the-surface Swim Streamer

Epic Swim 2020 members Nick Hobson, Jon Ornée, Dave Ornée, Jeremy Sall, Matt Smith, and Todd Suttor, filmed by Michael Dillon, used an on-the-water swim streamer while swimming across Lake Michigan.

External links