This video from England says about itself:
2 April 2014
R/V Song of the Whale travels up the River Thames, in search of harbour porpoises.
From Wildlife Extra:
A research team on board the unique, non-invasive whale research vessel Song of the Whale will carry out the first ever comprehensive scientific study to assess the population of Harbour Porpoises (the UK’s smallest cetacean) in the Thames Estuary between March 5 and 14.
Marine Conservation Research International (MCR), which owns and operates the boat, will carry out acoustic and visual surveys using underwater microphones (hydrophones) and visual techniques, funded by the International Fund for Animal Welfare (IFAW) and with help from conservationists from the Zoological Society of London (ZSL).
The aim is to find out more about where this shy species is located in the tidal Thames and the threats porpoises face from human activities such as man-made underwater noise and litter.
This essential information can help in efforts to conserve the species.
An open day for members of the public to visit the boat will be held on Sunday March 8 at the Hermitage Community Moorings, Hermitage Wharf, Wapping.
The survey events will be as follow: March 5, when there is a training day in Ipswich; March 6, departure from Ipswich to Southend; March 7, Southend to Tower Bridge (day) and Tower Bridge to the Thames Barrier (night); March 8, 1-4pm, open afternoon for public, media and politicians; March 9, surveying Outer Estuary and Tower Bridge to Teddington Lock; March 10-14, further surveying of Outer Estuary and return to Ipswich.
Shore-based surveys involving members of the public will also take place at Rainham Marshes and Thameside Nature Park in Essex from 10am-4pm on Saturday March 7. These will be coordinated with assistance from the RSPB, Essex Wildlife Trust, Kent Mammal Group and ORCA.
For more information visit www.marineconservationresearch.org.