The development of an observational science like geology depends upon the personal experience of individual workers. I suggest that, with certain reservations, the best geologist is he who has seen the most rocks.
It is impossible to review all the data, reports, and publications of examples of seabed fluid flow. This chapter, organised as a round-the-world tour, comprises descriptions of examples of features associated with seabed fluid flow: pockmarks, seeps, mud volcanoes, and gas hydrates. The chapter provides the basic information required to undertake more analytical studies of these features, the processes that are responsible for them, and their implications.