the present invention addresses the problem of , speedily , driving down one or more foundation members , preferable monopiles , into the bottom of a liquid , to create a foundation for structures in an offshore environment , such as wind turbines . it provides an apparatus and method of foundation in an environmentally friendly way , for example , to the installment of multiple wind generators in offshore wind farms . in an example , it can be done by a positionable , self - supporting , temporary cofferdam , by transferring , positioning , adjusting , the temporary cofferdam from a vessel to the desired position on the bottom of the ocean , enabling early placing and adjustment of cofferdam and later driving in the foundation member . an aspect of the present invention is a method for environmentally safety as well as speedy foundation member installation for use in oceans and lakes . preferably , including a method for transporting a temporary cofferdam structure to a construction site , transfer of these cofferdam structures to the bottom of the flooded area , where installation position and angle is adjusted by means of adjustable legs or the like , to enable a self - supporting cofferdam in the ocean or lake . a contained volume between the cofferdam structure and the foundation member is then created . pumps then remove water from the contained volume resulting in air entering through the opening in the top . this reduces transportation of hydro acoustic effects from driving down the foundation member into the bottom of the ocean or lake , which ensures minimal amount of vibrations to the surroundings . the apparatus according to the present invention is preferably transported on and deployed from a vessel that is able to move or be moved , for example a floating transportation vessel , such as a boat or a jack - up rig . fig8 a and 8b shows an embodiment of the present invention , a tube structure 3 has been partly lowered into a liquid . the tube structure 3 can be held in place by a jack - up rig , boat or support means with legs resting on the bottom of the liquid 9 . the tube structure 3 rests on the bottom 9 . resting the tube structure 3 on the bottom 9 can help in stabilising the tube structure 3 . within the tube structure 3 , a foundation member 10 has been lowered . both the tube structure 3 and the foundation member 10 extend over the surface of the liquid 14 . the sealing means 7 are fixed to the tube member 3 and is in sealing contact with the foundation member 10 . the pump 15 can then empty the liquid initially present in the contained volume 12 . the pump 15 has an inlet connected with the contained volume 12 and outlet in the liquid . the contained volume 12 can then be kept substantially free from liquid , while the foundation member 10 is driven down into the bottom 9 , for example by a hammer . the skilled person will know , that it is very difficult the keep sealing means 7 entirely tight as the foundation member 10 is moved in relation to the sealing means when driven into the ground 9 . it is therefore necessary to keep the pumps running throughout the operation of driving down the foundation members 10 , in order to ensure a substantially liquid free contained volume 12 . the reduction of sonic vibrations in the liquid is reduced due to the liquid free section of the contained volume 12 . fig8 a shows a tube structure 3 in one piece whereas 8 b shows a telescopic tube structure 3 . fig1 disclose a simplified sketch of the present invention in an embodiment comprising an offshore vessel 1 , jack - up legs 2 , tube structure 3 ( also known as cofferdam structure ) with adjustable legs 4 , tube structure lifting system 5 , tube structures in storage area 6 and sealing means 7 . the jack - up vessel 1 provides a stable platform for transport and placing of the tube structures 3 . fig2 shows a simplified sketch of an embodiment of the present invention with a tube structure 3 transferred from store to cofferdam structure lifting system 5 by the transfer system 8 . fig3 shows a simplified sketch of the invention at hand in an embodiment showing a tube structure 3 being lifted to the bottom 9 of the liquid by the tube structure lifting system 5 . fig4 shows a simplified sketch of the invention at hand in an embodiment showing a tube structure 3 being angular adjusted by the adjustable legs 4 on the tube structure 3 . fig5 shows a simplified sketch of the invention at hand in an embodiment showing a tube structure 3 being positioned on the sea bed 9 for later driving down of the foundation member 10 . fig6 shows a simplified cut through sketch of the invention at hand in an embodiment showing a foundation member 10 being driven into the sea bed 9 by a pile driving hammer 11 , while the contained area 12 , between the tube structure 3 and pile 10 is kept dry by means of a pump , this will reduce the sonic vibrations generated when the foundation member is driven down in the bottom 9 . in addition , an auxiliary noise reduction system is blowing out gas in to the surrounding sea water , surrounding said tube structure 3 with a gas bubble curtain 13 , which reduces the sonic vibrations from the driving down of the foundation member 10 even further . the auxiliary noise reduction system can use a pump for generating the bubble curtain , and preferably the pump is the same pump 15 as used for emptying the contained volume 12 from liquid . fig7 shows a simplified sketch of the invention at hand in an embodiment showing a foundation member 10 in final position with the tube structure 3 still enclosing it . afterwards the tube structure 3 is , preferably raised and removed from the foundation member 10 . an embodiment of the invention relates to a method of establishing a temporary cofferdam structure in a flooded environment , to allow driving in the foundation for a structure on the bottom of a flooded environment in an environmentally friendly way , including the steps of transporting a cofferdam structure to the right position , lowering said cofferdam structure to proper contact with said bottom of said flooded environment , positioning said cofferdam structure in proper angle by use of said cofferdam structures self - contained adjustable structure , inserting and driving down said foundation member , after which , said cofferdam structure will be raised to ensure that it has no metal contact with said newly driven in foundation member . the cofferdam structure and the foundation member , together , when the said foundation member is installed in the cofferdam structure , enables a contained volume , enabling said foundation members outer perimeter to be kept of direct contact with the fluid of flooded environment . said contained volume is secured by an installed seal between said cofferdam structure and said foundation member . preferably , said contained volume is made by emerging the cofferdam structure partly into sealing contact of said bottom of said flooded environment . using the material of said bottom as seal . preferably , said cofferdam structure is made out of 2 or more telescopic parts relatively elongateable to each other , to allow for different water levels and easier lifting and or transportation of a cofferdam structure . preferably , said contained area is kept secured by letting said seal be of an expandable type , enabling a tight seal , even at depts . preferably , said contained area is kept secured by letting said seal of an expandable type be expanded by a gas , fluid or a mix of the two , to enable a chosen expandability or contraction . preferably , said foundation member is of a hollow type , enabling an additional contained area while said foundation member is in a sealing contact with the bottom of the flooded environment , this contained area allows adjusting of vibrational characteristics of said foundation member . preferably , one or more contained volume is filled , partly or fully , with gas to allow adjusting of vibrational characteristics of said foundation member . preferably , said one or more contained volume is emptied , partly or fully , to allow adjusting of vibrational characteristics of said foundation member . preferably , said one or more contained volume is filled , partly or fully , with a mixture of gas and fluid to allow adjusting of vibrational characteristics of said foundation member . preferably , said one or more contained volumes is used as insulation to allow adjusting of vibrational characteristics of said foundation member . preferably , said one or more contained volume is emptied , partly or fully , with a pump to allow adjusting of vibrational characteristics of said foundation member . preferably , said one or more contained volumes are filled , partly or fully , with a mixture of gas and fluid with a pump to allow adjusting of vibrational characteristics of said foundation member . preferably , the driver , driving down said foundation members into said bottom of said flooded environment is a hammer or a hammer like mechanism . preferably , the driver , driving down said foundation members into said bottom of said flooded environment is a vibrator . preferably , the method or system is installed on a vessel for transportation in a flooded environment ; this might be any kind of relevant vessel . preferably , a gas bubble curtain being blown out , around the extendable guide , at the lower part of the extendable guide , while driving in said foundation member to reduce noise mitigation from said extendable guide and said foundation member , to the flooded environment . the term “ flooded environment ” can be a saltwater - based area or a freshwater - based area or mixture hereof . the saltwater based area can be the ocean or a lake and the freshwater based area can be a lake , river , pond , or an artificially flooded area created by humans . preferably , said transportation unit for transportation in a flooded environment is a floating transportation unit , like a ship , a boat , a pram or other floating transportation units . preferably , said transportation unit for transportation in a flooded environment is a wheel based , belt driven or other rolling or driving transportation unit , like a truck , a crane or other wheel based , belt driven or other rolling or driving transportation units . preferably , said transportation unit for transportation in a flooded environment is a flying or hovering transportation unit , like a plane , a hovercraft , a helicopter or other flying or hovering transportation units . preferably , said transportation unit for transportation in a flooded environment is a jack - up type vessel . preferably , said foundation member is a construction of steel , concrete , plastic , composites , ceramics , other rigid or semi - rigid material or any mixture hereof . preferably , said self - contained adjustable structure contains one or more legs for interacting indirectly or directly with said bottom to alter or stabilize the angle of said cofferdam structure relatively with said bottom . preferably , said self - contained adjustable structure contains one or more pivot able members interacting with said bottom to alter or stabilize the angle of said cofferdam structure relatively said bottom . preferably , said self - contained adjustable structure contains one or more elongation able members interacting with said bottom to alter or stabilize the angle and / or alter the horizontal position of said cofferdam structure relatively said bottom . preferably , said driving of foundation members into a bottom of a flooded environment is made by means of rotation of the foundation member relative to said cofferdam structure . preferably , said driving of foundation members into a bottom of a flooded environment is made by means of rotation of a fluid or stiff media inside the foundation member relative to said bottom of said flooded environment .