Not quicksand - it's fastmud

 

The mud flats of Turnagain Arm in Alaska (adjacent to Anchorage) are no joke.

They can trap unwary (or foolish) hikers, and never let them go.  And drown them.

Shocking video shows how quickly a 5lb rock completely disappears in Alaska mudflats in stark warning to tourists months after Illinois college student Zachary Porter, 20, got stuck in Turnagain Arm and died

• A shocking video demonstrating the power of Alaska's deadly mud flats has gone viral online months after Zachary Porter, 20, drowned at Turnagain Arm
• The alarming footage shows how quickly the black veiny mud flats in Anchorage, Alaska can swallow up a five pound rock
• Porter, a college student from Lake Bluff, Illinois, was visiting the tourist attraction with friends in May when he became stuck in the flats and drowned

The other problem is, if you get stuck (like the unfortunate young man), the tide comes in fast, sometimes with a surfable tidal bore.