Marigoldsleak

Hi there, apologies for everything. I am moored in Mile End in a boat we are refurbishing and a leak sprung, we have tried jamming things in it, glue, even hot tat and cannot fix it. I have a bilge pump running but am very worried and won't sleep with it like this. The hole is in the hull base and is approx. 3 x 5mm and it is pouring in! Does anyone have any leak fixing gear they can lend me asap. Alternatively, can anyone recommend a dry dock or yard that can pull out of water to take the boat to for welding? Thanks you so much, Mark