From Science Magazine.

In order to withstand the crashing waves, mussels have strong filaments called byssal threads to help them stick to rocky surfaces with surprising strength. When needed, the bivalves can also release these threads with seemingly little effort.

Video by: Luke Groskin
Link to video: https://youtu.be/63ge4qvz19E
Link to paper: https://www.science.org/doi/full/10.1126/science.adi7401