The tidal range in that area is the second highest in the world, behind only that of the Bay of Fundy in Nova Scotia.

BBC: Sully island back on market with new ?95K price tag

When interest rates inevitably rise, the value of those bond holdings may drop faster than the tide at the Bay of Fundy, but for now bonds are attracting those most afraid of getting in over their heads.

FORBES: You're Gonna Need A Bigger Boat