SB 8.24.33

tri-lokyāṁ līyamānāyāṁ
 saṁvartāmbhasi vai tadā
upasthāsyati nauḥ kācid
 viśālā tvāṁ mayeritā
Word for word: 
tri-lokyām — the three lokas; līyamānāyām — upon being merged; saṁvarta-ambhasi — in the water of destruction; vai — indeed; tadā — at that time; upasthāsyati — will appear; nauḥ — boat; kācit — one; viśālā — very big; tvām — unto you; mayā — by Me; īritā — sent.
Translation: 
When all the three worlds merge into the water, a large boat sent by Me will appear before you.