Check out this video of what happens when you get a remotely operated vehicle entrained within a turbidity current.
Observations of turbidity currents (underwater sediment laden flows) are exceedingly rare and this video and associated measurements provide unique insight into the structure and concentration of these enigmatic and hazardous flows. The observations were collected and published by Esther Sumner with colleagues from Monterey Bay Aquarium Research Institute:
Sumner and Paull (2014) Swept away by a turbidity current in Mendocino submarine canyon, California. Geophysical Research Letters, DOI: 10.1002/2014GL061863