Crew kitted in similarly bright orange coloured sea safety-survival suits entered the lifeboat before it plunged into the water. The activity was observed through the binocular-scope which overlooks Coliemore Harbour with excellent views across the sound to Dalkey Island, Dublin Bay and Howth Peninsula.

The binocular-scope does not require payment to operate and was unveiled in 2008 in memory of local resident the late Dr. John de Courcy Ireland, the 'father' of maritime Ireland (to read more click HERE). He was for 26 years a honorary secretary of the local RNLI station in Dun Laoghaire and a staunch campaigner of Irish maritime affairs.

Each Monday a routine lifeboat practice is conducted by the 47ft Trent class ALB (all-weather lifeboat) RNLB Anna Livia (info and PHOTO). Last night's drill also involved the new D-class ILB (inshore lifeboat) RNLB Réalt na Mara which was named earlier this year by Kathy Kenny, wife of RTE presenter Pat Kenny.

Under the cover of darkness the crew of the ILB Realt na Mara simulated an 'injured casualty' on the island where the casualty was prepared to be taken off by stretcher from the island's small harbour. From there the casualty was transferred to the larger RNLB Anna Livia which lay offshore. During the exercise, powerful searchlight beams from the ALB provided essential light to assist in the transfer operation.

Asides the lifeboats, there is plenty of wildlife to observe on the rocky outcrops at Maiden Rock, Clare Rock and Lamb Island, which forms the second largest island after the main island of 22-acres, where a resident herd of goats have been part of the local community for over 200 years.

As for the South Korean built Cumbrian Fisher, she too has close connections with these waters as she was named in Dublin Port in 2005. She is a frequent caller to Dublin bringing bulk liquid products from the oil refinery in Milford Haven, Pembrokeshire which is a major supplier, serving the demands of the capital.

Dublin Port has two oil jetties which cater for four tankers, where bitumen, chemicals, liquid petroleum gases, molasses and oil are handled on a 41-hectare zone with storage for 330,000 product tonnes to include 6,000 tonnes of LPG. In addition aviation fuel is frequently delivered to the terminal to satisfy the constant demand for aircraft using Dublin Airport.

Cumbrian Fisher alongside her sister Clyde Fisher where built for James Fisher & Sons and in recent years they have tended to take anchorage off Dalkey Island and off the Nose of Howth. In comparison the vast majority of vessels anchor in Dublin Bay which is divided into quadrants for the purposes of anchorage allocation.

Before the completion of the South Wall in Dublin Port, which considerably improved safer access of vessels entering the River Liffey, it was the relative deeper and sheltered waters of Dalkey Sound which were used instead as Dalkey acted as the principle port for Dublin between 14-17th centuries.

Vessels would convey cargoes which were taken to and fro by lighter to the coast where it was carried by horse and cart to nearby Dalkey before onward travel across the exposed plains to Dublin City.

To learn more about Dalkey's medieval maritime heritage with its relationship with the capital of Dublin in addition the use of Dalkey Quarry in the construction of (Kingstown) Dun Laoghaire Harbour, visit the Dalkey Castle & Heritage Centre.  To read more go to www.dalkeycastle.com in addition to further information about Dalkey including the local community council newsletters click HERE.

Regular guided tours will provide a fascinating insight into the work of the Commissioners of Irish Lights (CIL). The tours (first-come basis) are also available for disabled access and they start from 12 noon to 5pm, noting the last tour is 4.30pm. Location: Harbour Road, Dún Laoghaire.

Like most of the tours and events in Open House Dublin, there is no pre-booking required. Entry is FREE and on a first-come basis. For more information about what to expect from your tour or event, check the How It Works by clicking HERE.

CIL operate the 79m aids-to-navigation tender ILV Granuaile which is based at her homeport of Dun Laoghaire. The 2,625grt tender was built by the Dutch Damen Shipyard group in Galati, Romania. She was then towed to The Netherlands where further outfitting work was conducted. She entered service in 2000 and she is the third tender to be named after the Mayo pirate queen.

Occasionally ILV Granuaile can be seen moored alongside the berth adjacant to the marine depot accessed through Dun Laoghaire Marina, though she mostly calls to the harbour's western bight area, using her DP (dynamic-positioning) mode. Her design is ideally suited for buoy and chain work, search and rescue, salvage and recovery, towing, hydrographic applications, and ROV work.

She is shallow drafted at 4.4m and has heavy lifting equipment including a 20 tonne aft-mounted crane with an outreach of 20m. Accommodation is for a crew of 16 in addition there are cabins for a further 10 persons.

The tour which is free starts at the meeting point of the Queen Victoria Fountain which too forms part of the tour alongside the George VI memorial
and the Christ the King monument.

The outdoor event is part of the 'Summer of Heritage' which is organised by Dun Laoghaire-Rathdown County Council. The initiative is now in its fourth year and this year's highlight of the programme are tours of the newly renovated Seapoint Martello tower.

The coastal structure has been restored and is a fine example of these 19th century defensive forts, built along the coast to defend during the Napoleonic wars.

This summer also sees Carrickbrennan graveyard feature for the first time, the resting place of many sailors lost in maritime disasters since the 17th century.

Sightseeing along 'The Metals', a historic pathway that linked the quarry in Dalkey to the harbour in Dún Laoghaire also returns in the programme due to its popularity last year.

To read more about the the Summer of Heritage other free events in the arts, literature, sports, music and for the family, go to www.dunlaoghaire.ie/summer-of-heritage/ and www.dlrevents.ie/heritage11.html

Alternatively walkers are welcomed to take the walk in the reverse direction starting at Howth and terminating at Dun Laoghaire. The walk takes approximately 4-hours to complete. The 16.4 mile route that skirts the shores of Dublin Bay will offer great views!

The walk last year was taken by families, friends and individuals and provided participants with a great sense of achievement!

For this year's event, walkers are invited to take part by booking places in advance online. Entries (€10 per person) close at midnight on Sunday 13 March, click HERE. Late registration will also be available on the morning of the walk  (€15 per person) or email [email protected]

To read more about Aware click http://www.aware.ie (noting the locall Aware Helpline Tel: 1890 303 302 / calling from overseas +353 1 6766 166) and further information about the Helpline click HERE