But since the early 20th century, a slew of previously untouched shipwrecks have been discovered, uncovering veritable underwater timecapsules and breathtaking views of ocean-floor wreckage.
Comets can act as "time capsules" delivered not only from great distances but also from times long past, as top astronomers revealed in a recent broadcast of BBC Radio 4's In Our Time.
Whereas the orbiter could carry seven people at a time into orbit, the Russian Soyuz capsules being used at the moment will only ferry three individuals per flight.
It is the third time in the space station's history that a crew has had to take shelter in escape capsules because of the possibility of being hit by orbital debris.