Submarining

Submarining may mean in:
 * Engineering sciences, the design, construction and use of submarines
 * Cars (in the 1960s), when a driver or passenger slides forward under a loosely fitted seat belt
 * Wrestling, a term used in Road Wild (1997)
 * Online dating (since 2017), staying away for weeks or months and suddenly reappearing ( "resurfacing" ), mostly neither mentioning the absence nor giving an explanation and not even trying to ask for an excuse; similar to ghosting